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She concluded by saying, "It is just Harry and Meghan are making all sorts of excuses not to come and share Christmas with the Queen".
In its defence, The Mail on Sunday maintains that it was Thomas Markle who asked the media to publish the extracts from the letter after claims about its existence started to circulate.
In the documents submitted to the court, Megan had to admit that she passed on personal information to the authors of the book "In Search of Freedom: Harry, Meghan and the Creation of the Modern Royal Family" Omid Scobie and Carolyn Duran.
The new court documents reveal that the Duchess sought advice from two senior members of the royal family about how to respond to her father, which prompted her to write the letter at the centre of the letter battle.
In court documents amid her trial against the Mail, the Duchess of Sussex revealed that she allowed a third party to pass along the private information to the two royal insiders.
The two royals are not named and Meghan's legal team could be referring to a number of other members of the family.
Early this year, the couple announced they were stepping back as senior members of the British royal family and moving to North America.
The insight that does not name the particular members of the Royal Family who she spoke with was provided in Meghan's legal claim for damages for breach of copyright and privacy against Associated Newspapers.
Meghan's lawyers said she showed a draft of the letter to her husband and to Knauf, and that Knauf provided "feedback on the draft but no actual wording". Their son, Archie, was born the following year. They recently bought a house in Santa Barbara, Calif.
The Duchess' legal team also denies the idea that she and Harry had final approval of Finding Freedom's contents, and refutes the rumors that they have received financial aid from taxpayer funds.
A latest court document reveals that Meghan took advice from two senior royal over strained relations with her father Thomas Markle and how to prevent him from speaking to the press.
Her lawyers argue that despite external collaboration, there was no discussion about the letter being used as part of a "media strategy" to enhance her image. He has since slammed his daughter in the media on several occasions and accused her of abandoning him.
A trial was due to take place in January 2021, but this has now been postponed until autumn 2021, with the Duchess' legal team citing "confidential grounds" as the reason for a postponement. But Meghan did allow an unidentified individual to communicate the "true position" on one aspect of her relationship with her father to the authors, the new document says.
In a ruling on aspects of the case on Wednesday, Warby said Thomas Markle had not been told the reason for the delay.