Ms. Allred said she was not concerned about the motivations of partisans who might fund Ms. Zervos’s case against Mr. Trump.

“I have neither the time nor the interest to interview each donor and ask them why they would want to support our client,” she said, “so I have no way to know whether they have a political agenda, or they just think truth matters.”

Ms. Allred maintains an active online appeal for Ms. Zervos’s case, and has personally solicited donations from influential Democrats. She has discussed fund-raising assistance with Mr. Brock, once a self-described “right-wing hit man” who switched sides and eventually became one of Hillary Clinton’s fiercest loyalists during her campaign against Mr. Trump.

Ms. Allred said her fund-raising for the Zervos case had so far yielded “just under $30,000,” mostly in small donations. The money is being used for expenses like depositions and has not gone to pay legal fees, which already have reached $150,000, said Ms. Allred, who added that neither she nor Ms. Zervos would personally accept any of the money raised.

“We certainly do not see any prospect of being paid by the fund based on the amounts donated to date,” she wrote in an email. “Nevertheless, we will continue to devote ourselves to Ms. Zervos’s case because we believe, as does Ms. Zervos, that truth matters and that President Trump should be held accountable for his words and his actions.”

During the presidential campaign, Ms. Zervos said Mr. Trump sexually assaulted her in 2007, after she appeared as a contestant on his reality TV show, “The Apprentice.” He dismissed her accusations and those of other accusers as “made-up nonsense” and suggested they were motivated by fame, or were being put up to it by Mrs. Clinton’s campaign — comments that formed the basis for the defamation suit Ms. Zervos filed after the election. A judge is deciding whether to allow the lawsuit to proceed.