After learning about some of the alleged incidents at the party, the girl emails Mays.
"Why the f--- would you let that happen. Seriously, you have no f---ing respect. People are telling me so much s--t, why the f--- would you take my clothes off in front of everyone. You shouldn't have let that happen," she wrote.
Richmond's lawyer declined to make an opening statement when the jury-less trial began Wednesday in juvenile court.
But he has told ABC News' "20/20" that what occurred that night was consensual.
Brian Duncan, a lawyer representing Mays, said simply: "Trent Mays did not rape the young lady in question."
Richmond, in an exclusive interview recently with "20/20" anchor Elizabeth Vargas, said, "I didn't rape anybody. I didn't witness a rape going on."
"And if I would have thought that somebody was being raped or anything like that, I would have stopped it."
If convicted, the teens could serve prison time until they turn 21.
The case drew further attention when some outside the small rustbelt town accused local officials of willfully protecting the football players, seen as hometown heroes.
For more on this story, watch "20/20" Friday, March 22 at 10 ET