Beverly Young Nelson, who voted for Donald Trump, said that Roy Moore sexually assaulted her at the age of 16 and told her "You're just a child.if you tell anyone about this no one will ever believe you".
Ms Nelson's legal team say they hired a handwriting expert, who they claim has verified Mr Moore's signature in the book as genuine.
Allred said Thursday that beneath Moore's signature, Nelson added notes "to remind herself who Roy Moore was and when he signed it".
Nelson first made her allegations four days after The Washington Post first reported on allegations by Leigh Corfman, who said she was 14 years old when Moore undressed her and touched her over her underwear and guided her hand to touch him over his underwear.
It is not clear whether Moore or Nelson wrote "D.A." after Moore's signature. "Anyone who accuses her or me of a crime should proceed at their own risk and own peril".
Moore has denied it is his handwriting, and has called for her to allow his campaign to have a handwriting expert to examine it. "Nelson still attributes the note and signature to Moore", the site wrote.
The 70-year-old Moore, in a tight race against Democrat Doug Jones, tweeted his thanks to Trump for the endorsement..
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Allred said Friday that she will hold a press conference later in the day to address the authenticity of Moore's signature.
So, why did Nelson add additional language to the alleged inscription?
Some corners of conservative media, which has gone all in on Moore in Alabama's upcoming Senate race, have latched onto Nelson's admission as proof that she has invented her entire story from thin air. "Judge Moore says there's no way in the world that that's his handwriting ..." Within the note Nelson said Moore wrote are the words "Christmas 1977" - and the 7s appear to be different from ones in the 12-22-77 notation written at the bottom that Nelson has now revealed she wrote herself. "We've always said in the end truth will be known".
None of that bothered Trump as he stumped for the oft-accused sex offender, saying Moore's win was crucial to make America great again. This contradicts an interview Moore gave with Sean Hannity on November 10, in which Moore said he knew two of the accusers when they were teenagers.
"I still have some fear, but I refuse to be intimidated into silence to retract anything that I have said", declared Nelson. But in the campaign's final weekend, the Republican president is engaged and fighting to rally voters behind his anti-establishment ally.
Maddalena, 51, said she was heartened by Trump's support for Moore but was backing the judge regardless.
Nelson also said she has faced harassment and threats since coming forward with her allegations, saying a radio talk show host called for her to be stoned in the town square and someone sent a photo of a casket to her. "If things like that are going on, you'd definitely hear about it".