She stated, "He wrote in my yearbook as follows: 'To a sweeter more handsome girl, I could not say Merry Christmas, Christmas, 1977, Love, Roy Moore, Olde Hickory House". Nelson said she voted for Trump in 2016.
Allred said Friday that Moore did not write several notes at the end of the inscription.
Nelson and her attorney, Gloria Allred, are expected to hold a press conference Friday where they claim to present new evidence of the incident between Moore and Nelson. "After Judge Moore's signature, it has the initials capital D.A. Remember I told you about that 99 divorce action?"
She admitted to adding the date and location, but Young claims that the rest of the inscription was written and signed by Roy Moore.
Besides examining the yearbook, Allred said Anthony also authenticated Moore's handwriting on a graduation card that Debbie Wesson Gibson said she received from Moore. ABC's Tom Llamas asked during the interview aired today. She said she knew Moore when she was a 16-year-old waitress at an Alabama restaurant, and accused him of sexually assaulting her in his auto after offering her a ride home.
Nelson said that she originally met Moore when he was a 30-year-old deputy district attorney in Etowah County and would regularly eat at a restaurant in Gadsden called Olde Hickory House.
Conservative media outlets and supporters of Moore quickly pounced on the admission as proof that Nelson was not being truthful.More news: Piggy: fifth time sexiest Asian women to win
One piece of evidence Young used against Moore was an inscription in her yearbook that was allegedly written by Moore himself. Now she herself admits to lying.
During a news conference in Atlanta Friday afternoon, Nelson again appeared alongside Allred and doubled down on her accusations against Moore.
Allred said an independent forensic handwriting analyst had examined the signature, and the handwriting before the signature, and concluded they were made by Moore. "And it demonstrates that when Roy Moore stated, quote, 'I do not know any of these women, ' end quote, that statement does not appear to be true", Allred said.
Jauregui said the allegation has been painful.
The Moore campaign previously attacked the credibility of Nelson's account by pointing out the difference in writing styles in the inscription.
With just days to go before Tuesday's voting in Moore's Senate race against Democrat Doug Jones, his campaign has been roiled by this and other accusations of sexual misconduct decades ago.
This week US President Donald Trump gave Mr Moore his formal endorsement.