This a huge red flag to me. When I read the letter, I thought, this guy needs to go. Once I really took my time to digest it, she actually does not make any real claims at all. She claims that he was there but other than that, it's all conjecture and states things in general terms without any factual statements. Things like, "making demeaning statements" "was in a line to go next" How does she know anyone in line was waiting their turn? Did they have a ticket dispenser like at a deli? She only says that these things happened but never once said she saw what was happening. In her own rape, she never stated that they were involved just that they were present? Present in the room? at the party, or present at the party but not when it happened?
She is two years older than anyone else at the party and if this was actually going on and she did nothing, I truly think that she is more to blame than the boys at the party.