entitled Dick Whittington and Sleeping Beauty. She is best known for her books on Diana, Princess of Wales, and Queen Elizabeth The Queen Mother. Her 1992 book, Diana in Private: The Princess Nobody Knows, provided information about Diana's struggle with bulimia and her affair with James Hewitt (insights into these matters deriving from the fact that "one of [Campbell's] closest friends was one of [Diana's] closest friends"). Campbell was dismissed as a fantasist, but some of her claims were later vindicated. Diana in Private appeared on The New York Times Best Seller list in 1992. Campbell later claimed that the book initially started as an authorised official biography but later Diana decided to make it an unofficial one and use it as a "get out of jail card" after being "advised by friends that she should play the victim." Campbell's 2012 book, The Untold Life of Queen Elizabeth The Queen Mother, was met with criticism. Her theorising, including claims quoting the Duke of Windsor regarding the Queen Mother's parentage, was dismissed by writers Hugo Vickers and Michael Thornton as "bizarre" and "complete nonsense". The timing of the publication of Campbell's book, a service of remembrance for the Queen Mother marking the tenth anniversary of her death, was also condemned. In The Sunday Times, the journalist Lynn Barber opined that Campbell's claims ought not to be dismissed out of hand. In The Independent, reviewing Campbell's The Royal Marriages, Barber had described her pleasure in encountering "an author so exhilaratingly untrammelled by any fear (or knowledge?) of the libel laws. Nothing is beyond her", concluding "either (Campbell) is the greatest gossip since Pepys or she is a complete fabulist: one can only read it and gawp... Lady Colin Campbell never bothers her head with anything so tedious as verification". In 2020, Campbell released another biography called Meghan and Harry: The Real Story, addressing Meghan and Prince Harry's life, romance and ensuing rift with the Royal Family. Her other books include a book about her own mother titled Daughter of a Narcissus: A Family's Struggle to Survive their Mother's Narcissistic Personality Disorder, and a book about Queen Elizabeth II titled The Queen's Marriage. Campbell has been called a "polarizing figure" by Vanity Fair and an "amusing dinner partner" by Tina Brown. Television Campbell appeared on Comedy Nation, a British TV show. In November 2015, she took part in the fifteenth TV series of