I think that it could happen when they are ashamed to tell her parents or boyfriend. Then those people basically call the police etc. while she starts to lose more and more control.Sometimes I don't understand why a woman lies about rape.
Are they ashamed of the sexual encounter or something? Or just evil people?
Now she would not only have to admit to the sexual encounter, but also that she has lied about the rape. And instead of just her parents she would have to confess it to the police or a judge.
So the more time passes the worse it gets.