“The only offer made was, ‘Plead to a felony and take probation,’ or, ‘If she would agree to plead to a misdemeanor, we would consider whether to accept,’ ” he said.

Ms. McMillan, 25, is scheduled to be sentenced Monday morning before Justice Ronald Zweibel in State Supreme Court in Manhattan. She faces up to seven years in prison, though the judge could also opt to give her as little as one day in jail and probation. If her trial and the aftermath serve as a guide, the courtroom will be packed with her supporters, who have urged Justice Zweibel to be lenient.

Mr. Stolar said he would argue at sentencing that Ms. McMillan’s decision to go to trial should not be held against her. If prosecutors push for state prison time, he said, they will be seeking “to punish someone for having the nerve to go to trial.”

That Ms. McMillan, a graduate student and volunteer labor organizer, has come to embody the frustrations of those arrested during the protests is a quirk of fate; according to her testimony, she never intended to join the civil disobedience that night in 2012.

Instead, she had been out celebrating St. Patrick’s Day. She said she went to the park to meet a friend and found herself in a confrontation with an officer, Grantley Bovell. Mr. Bovell testified that Ms. McMillan elbowed him in the eye as he escorted her out of the park. An onlooker’s videotape supported his account. For her part, Ms. McMillan said she lashed out at the officer instinctively after he groped her right breast.