Therapy is an environment based around giving control of life back to the victim. Your actions are not; they're just going to add more chaos to her life and make things worse.
Ive been waiting for someone to tell me how. She wont even know
This represents a radical misunderstanding about rape; rape is not the same as sex. Rape is a crime of anger and violence in which sex is used as a weapon; he does not need a penis to continue raping. The fact that she didn't like it does not mean
I know this. But it does mean he cant penatrate another woman with his god-given penis.
It is recommended by many authorities, including FBI psychologists, that the partners (and even family) of rape victims should be counselled, not just the person who was raped. The fact that you are clearly demonstrating an irrational reaction to the situation at current shows that: yes, you DO need counselling. You're obviously more concerned about yourself and your feelings than her because if you actually cared about her you would respect her wishes to let it lie and not be entertaining your hero complex fantasies.
You hunting the guy down and hurting him will not fix a single thing, and in fact will probably just cause her more distress and prolong her recovery period, not to mention causing you to fuck up your own life so she doesn't even have you to rely on.
So, in short. Get yourself counselling (her therapist is probably a good one to go to, by yourself and not with her, at least initially) because you are clearly completely out of your depth and have no understanding about rape, it's impact, or it's treatment.