The Duchess of Sussex says she had not remembered exchanges with an aide over the Finding Freedom book.
The Duchess of Sussex has apologised to a court for forgetting she asked a senior aide to brief the authors of a biography about her.
She denied intentionally misleading the High Court after an appeal heard her former spokesman provided information to the authors of Finding Freedom.
Jason Knauf told a court Meghan gave him briefing points to share with them.
Associated Newspapers is appealing against a ruling over publishing a letter from the duchess to her father.
Meghan, 40, won her case against the publisher of the Mail on Sunday earlier this year, when the High Court ruled its publication of the letter was unlawful.
Associated Newspapers’ legal team are seeking to overturn this judgement at the Court of Appeal, disputing that this was simply a private and personal letter – and have argued that it was crafted with the “possibility of public consumption” in mind.
A spokesman for the Sussexes had previously said the couple “did not contribute” to the Finding Freedom biography, written by Omid Scobie and Carolyn Durand.
But in new evidence heard on Wednesday, Mr Knauf, the couple’s former communications secretary, said the book was “discussed on a routine basis” and “discussed directly with the duchess multiple times in person and over email”.
He also discussed planning a meeting with the authors to provide background information and said Meghan had given him briefing points to share with them, including information on how she had “very minimal contact” with her half-siblings during her childhood.
In a witness statement to the court the duchess said she accepted that her aide did provide information to the authors of the book with her knowledge but she said the “extent of the information he shared is unknown to me”.
“When I approved the passage… I did not have the benefit of seeing these emails and I apologise to the court for the fact that I had not remembered these exchanges at the time,” she said.
“I had absolutely no wish or intention to mislead the defendant or the court.”
The duchess added that she would have been “more than happy” to refer to the exchanges with Mr Knauf if she had been aware of them at the time, but said they were “a far cry from the very detailed personal information that the defendant alleges that I wanted or permitted to put into the public domain”.
Another reason the duchess gave for not discovering the emails between her and Mr Knauf sooner was that the disclosure stage of the litigation had not yet been reached, and in October last year her lawyers applied to adjourn the trial date as she was pregnant.
She said she was advised to avoid stress after a recent miscarriage, which came shortly after Associated Newspapers Limited indicated it wished to reveal the identities of her five friends who gave an interview to the US magazine People, in which they referred to her relationship with her father.
Meghan said: “I was in the first trimester of my third pregnancy at the time, having suffered a miscarriage a few months prior, and was feeling very unwell.
“My doctor advised me to avoid stress, particularly given the recent miscarriage days after the defendant threatened to break the confidentiality of the original ‘sources’ for the People magazine article, which resulted in my having to make an urgent application for an anonymity order.
“This was granted… but I found the process extremely stressful, and it took its toll physically and emotionally.
“I have at all times wanted to protect the privacy of those friends, while the defendant was, it seemed to me, doing everything it could to make this litigation as intrusive as possible.”