Well, I don't want to describe too much about this hypothetical girl lest I just ask you to put me into the story. But a few more things might not hurt. As I said in my suggestion for the twins she might be a willing participant in the events; even going so far as to egg on her would be rapists to hurt her or choke her during the rape because of some masochistic tendencies. Of course, she'd quickly change her turn once things too a step too far, although she might have secretly been hoping for them to take it a step too far all along until it actually happens.

Think a Dom that is actually a Sub; some one who might try and take control hoping they get overthrown violently.