How did her mother respond when you brought the rape incident up? Did MIL try to get her D into C after the rape or did she say how long it took before she knew about the incident?
It just seems weird to me....and I am somewhat leary about suggesting anything regarding her anger, etc. If she truly was raped.....I believe anything and everything could be a result from the rape.
There are several things that don't add up, but I am no professional about rape victims. But why was she ready to date you after only two weeks after the rape? It seems that she would have shunned all men for a while, but who knows why she reacted the way she did. Apparently she must have felt very safe with you. IDK......I think she just needs a professional and after all these years, it would probably be harder to work things out than if she had sought help right away.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!