A new TV documentary, "Diana: 7 Days That Shook The Windsors," is revealing shocking details about what happened in the seven days after Princess Diana's death in August 1997.
Specifically, the documentary makes an astounding claim about Queen Elizabeth's reaction to Diana's fatal car crash in Paris. After hearing the news from her private secretary, the queen reportedly said she thought someone must have "greased the breaks" on the car.
The shocking claim echoes what was reported in a book by royal biographer Ingrid Seward just two years ago.
Queen Elizabeth's eyebrow-raising remark greatly highlights her complicated relationship with Princess Diana. A source revealed the queen saw Diana as a "misfit who didn't quite contribute to the things they did and what they wanted her to do in the family."
Princess Diana Style Transformation
Princess Diana Style Transformation
Lady Diana Spencer, later the wife of Prince Charles, on her first birthday at Park House, Sandringham.
A very young Diana in a fancy pram.
Lady Di at age 2.
Young Lady Diana in a buttoned up dark coat.
Lady Diana at age 8, wearing a matching dress and headband.
Diana on holiday with her family, causal in a sweater and jeans.
Diana let her hair grow long during her youth, here age 10 in a wide-brimmed black hat.
Diana always had a passion for children, here at 19 working as a Nursery Assistant at a Kindergarten school.
Diana and Charles pose on the day of their engagement, showing off her diamond and sapphire engagement ring.
Diana was stunning on her wedding day, with the most glamorous dress and bouquet -- truly fit for a Princess.
The royal couple during their honeymoon in Scotland.
Diana attended an exhibition at the Victoria and Albert Museum, in a dress designed by Bellville Sassoon.
Princess Diana, pregnant and glowing at a Polo match in Windsor.
The Prince and Princess visit Wales, Diana wearing a suede beret by John Boyd and a coatdress by Arabella Pollen.
Diana was a vision in yellow as she and Charles visited a school in Alice Springs, Australia.
We're loving the pops of pink in Diana's outfit, here while watching Charles play Polo.
Diana talks with Prince Charles, who is on horseback, at a Polo match.
Diana is pretty in pink while attending the ballet Swan Lake.
Diana and a tiny Prince William leaving the Royal Yacht, the Princess in a belted plaid jacket.
Diana laughs with Nancy Reagan, the two ladies looking radiant in hues of red and white.
Diana rests her chin in her hands on the steps of her home at Highgrove.
Diana at a desert picnic in Saudi Arabia, wearing a purple and white outfit by Catherine Walker.
Diana attended Cannes Film Festival, wearing a stunning ice blue gown by Catherine Walker.
Diana was stunning at an evening function during a visit to Germany, wearing a gown by Victor Edelstein.
Princess Diana during a visit to Melbourne.
Diana and Wills at a polo club, the Princess casually dressed in a blazer with the British Lung Foundation logo on the front of her t-shirt.
Diana looked radiant in red and purple while in Hong Kong, the outfit designed by Catherine Walker.
During her visit to Hong Kong, Diana wore this stunning tiara and white dress, later known as the "Elvis Dress."
The Princess of Wales in mint on an official visit to Hungary.
Diana and her boys, attending a church service. Diana wore a pink and purple suit by Catherine Walker.
Diana wears her favorite designer once again, Catherine Walker, during an official visit in Brazil.
Diana wore this white dress and black jacket designed by Catherine Walker during a visit to Salisbury.
Diana was stunning at a banquet in Seoul, wearing the Spencer family tiara and a gown by Catherine Walker.
Diana looked lovely in this pastel suit, crouching down to speak with a young boy.
Lord Palumbo greets Princess Diana, wearing a short black cocktail dress designed by Christina Stambolian, as she atttends a gala.
Diana visited army barracks, wearing a Versace suit and a hat by Philip Somerville.
The Princess of Wales was gorgeous in this royal purple gown during a visit to Chicago.
Diana visited Washington, dazzling the entire country in this lovely white gown.
Diana was lovely in this pale blue cocktail dress by Catherine Walker, attending a charity reception.
Diana, Princess of Wales, was radiant in red during another visit to Washington, D.C.
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The royal family's aloofness towards Princess Diana affected her quite deeply. In a letter that she wrote to a close friend in 1991, Princess Diana revealed she felt "extremely isolated" from the royals at the time.
Since Diana's death, however, Queen Elizabeth has had quite a change of heart with how she feels about the mother of her grandsons:
"She would never say now that Diana hasn't contributed to the family. She sees how much Diana radiates out of William and Harry and the effect they have on ordinary people."
Princess Diana and Prince Charles together
Princess Diana and Prince Charles together
BALMORAL, UNITED KINGDOM - MAY 06: Prince Charles With His Fiance Lady Diana Spencer During A Photocall Before Their Wedding While Staying At Craigowan Lodge On The Balmoral Estate (exact Day Date Not Certain) (Photo by Tim Graham/Getty Images)
BALMORAL - AUGUST 19: Prince Charles, Prince of Wales and Princess Diana, Princess of Wales, wearing a suit designed by Bill Pashley, pose for a photo on the banks of the river Dee in the grounds of Balmoral Castle during their honeymoon on August 19, 1981 in Balmoral, Scotland. (Photo by Anwar Hussein/Getty Images)
UNITED KINGDOM - JULY 29: On July 29, 1981, Lady Diana SPENCER (aged 19) married Prince CHARLES (aged 32) at Buckingham Palace. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
LONDON, UNITED KINGDOM - JULY 29: Prince Charles And Princess Diana On The Balcony Of Buckingham Palace On Their Wedding Day. The Princess Is Wearing A Wedding Dress Designed By David And Elizabeth Emanuel. The Prince Is Wearing Naval Dress Uniform. (Photo by Tim Graham/Getty Images)
LONDRES, ROYAUME-UNI - 10 MARS: Lady Diana et le Prince Charles discutant avec la Princesse Grace de Monaco au Goldsmith's Hall, le 10 mars 1981 a Londres, Royaume-Uni. (Photo by Keystone-France\Gamma-Rapho via Getty Images)
(Original Caption) Queen Elizabeth joins the Prince and Princess of Wales on a Buckingham Palace balcony following their London wedding. (Photo by ï¿½ Wally McNamee/CORBIS/Corbis via Getty Images)
The Prince and Princess of Wales arrive back at RAF Lossiemouth in Scotland after their honeymoon, September 1981. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
The Prince and Princess of Wales at the Braemar Highland Games in Scotland, September 1981. She wears a tartan suit by Caroline Charles and a tam o'shanter hat. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
Prince Charles Prince Charles and the Princess of Wales (1961 - 1997, later Diana, Princess of Wales) at Caernarvon Castle during an official tour of Wales, 27th October 1981. (Photo by Hulton Archive/Getty Images)
UNITED KINGDOM - JUNE 22: Prince Charles, Prince of Wales and Diana, Princess of Wales leave St Mary's Hospital in Paddington with their baby son, Prince William (Photo by Tim Graham/Getty Images)
Prince Charles and Princess Diana at Uluru, Northern Territory on 21 March 1983. . (Photo by Gerrit Fokkema/The Sydney Morning Herald/Fairfax Media via Getty Images)
UNITED KINGDOM - SEPTEMBER 04: The Prince And Princess Of Wales With The Queen Attending The Braemar Games In Scotalnd (Photo by Tim Graham/Getty Images)
(Original Caption) Melbourne, Australia: Princess Diana and the Prince of Wales share a joke with Australian comedian Paul Hogan at a gala performance in Melbourne, April 14th.
Princess Diana (1961 - 1997) and Prince Charles arrive for a state reception in Hobart, Tasmania, 30th March 1983. The princess is wearing the Spencer family tiara and a dress by Bruce Oldfield. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
SYDNEY, AUSTRALIA - MARCH 28: The Prince And Princess Of Wales Attending A Charity Ball In Sydney During A Trip To Australia (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997) and Prince Charles leaving St Mary's Hospital, London with their new-born son Prince Harry, September 1984. The Princess is wearing a red coat by Jan van Velden. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
Princess Diana (1961 - 1997) and Prince Charles at an Italian naval base at La Spezia, 20th April 1985. Charles is wearing a naval Commander's uniform, while Diana is wearing a white coat dress by Catherine Walker. (Photo by Princess Diana Archive/Getty Images)
The Prince and Princess of Wales visit a church in Florence during their tour of Italy, April 1985. The Princess is wearing a suit by Jasper Conran. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
VATICAN - APRIL: Diana Princess of Wales with Prince Charles have an audience with Pope John Paul II in the Vatican, Rome, Italy in April 1985 during the Royal Tour of Italy.Diana wore a black lace dress designed by Catherine Walker. (Photo by David Levenson/Getty Images)
Princess Diana (1961 - 1997) and Prince Charles on a skiing holiday in Malbun, Liechtenstein, January 1985. The princess is wearing a Head ski suit. (Photo by Terry Fincher/Princess Diana Archive/Getty Images)
WINDSOR - JUNE 29: Princess Diana, Princess of Wales kisses Prince Charles, Prince of Wales as she presents him with an award following a charity polo match at Windsor Great Park on June 29, 1985 in Windsor, England. (Photo by Anwar Hussein/Getty Images)
WASHINGTON - NOVEMBER 9, 1985: (FILE PHOTO) In this file photo issued October 31, 2005, Prince Charles, the Prince of Wales and Princess Diana, the Princess of Wales meet President Ronald Reagan and First Lady Mrs Nancy Reagan at the White House on November 9, 1985 during an official visit to America in Washington DC, USA. Prince Charles, the Prince of Wales is taking his new wife Camilla the Duchess of Cornwall on a visit to the United States which begins formally on November 1, 2005 (Photo by Tim Graham/Getty Images)
VANCOUVER, CANADA - MAY 03: The Prince And Princess Of Wales During A Visit To Vancouver, Canada. She Is Wearing A Suit Designed By Fashion Designer Bruce Oldfield (Photo by Tim Graham/Getty Images)
LONDON - AUGUST 4: Prince Edward, Viscount Linley, Prince Charles, Diana, Princess of Wales and the Queen at the Queen Mothers 87th birthday celebration on August 4, 1987 at Clarence House in London, England. Diana wore a dress designed by Catherine Walker. (Photo by David Levenson/Getty Images)
WINDSOR, UNITED KINGDOM - JUNE 26: The Princess Of Wales Presents A Medal To Her Husband, Prince Charles, After A Polo Match At Windsor (Photo by Tim Graham/Getty Images)
AUSTRALIA - JANUARY 30: Diana, Princess of Wales and Prince Charles, Prince of Wales at the Central Coast Surf Carnival at Terrigal Beach, Sydney, Australia (Photo by Tim Graham/Getty Images)
ABU DHABI, UNITED ARAB EMIRATES - MARCH 15: The Prince And Princess Of Wales attend a desert picnic on March 15, 1989 in Adu Dhab, United Arab Emirates. (Photo by Georges De Keerle/Getty Images)
DUBAI, UNITED ARAB EMIRATES - MARCH 16: The Prince And Princess Of Wales On A Walkabout In Dubai On The Gulf Tour. Diana's Outfit Is By Fashion Designer Catherine Walker And Hat By Milliner Philip Somerville. (Photo by Tim Graham/Getty Images)
Princess Diana (1961 - 1997), wearing a Belville Sassoon dress, presenting Prince Charles with a trophy after competing at the Hola Cup polo match at the Guards Polo Club, Windsor, 29th June 1988. (Photo by Jayne Fincher/Princess Diana Archive/Getty Images)
PARIS - NOVEMBER: Prince Charles and Diana Princess of Wales meet guests arriving at a dinner in the Elysee Palace in Paris, France in November 1988, during the Royal Tour of France. Diana wore a dress designed by Victor Edelstein. (Photo by David Levenson/Getty Images)
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The documentary also delves deeper into how Princess Diana's sons, Prince William and Harry, handled her death. Harry, who was 12 at the time, was confused and wondered if his mother had really passed away.
"Prince Harry actually asked his father, 'Is it true Mummy's dead?" Tina Brown, the princess' biographer, said.
If you recall, the days following Diana's fatal car crash in Paris left the world in mourning. However, the royal family's initial reaction was to "do as they had always done," including going to church because it was a Sunday.
As Princess Diana's 20th death anniversary approaches, her sons have candidly opened up her death.
Prince William recently made some heartbreaking remarks about his late mother, who died when he was only 15 years old:
"I would like to have had her advice. I would love her to have met Catherine and to have seen the children grow up," William admitted to the publication. "It makes me sad that she won't, that they will never know her."