And here is what TheMatrix would have done had it been a non-reporting state...
1. I would have hugged her.
2. I would pray with her so that Jehovah can give her peace of mind.
3. I would contact the congregation where the abuser attends, so that they can take care of it judicially. (The other congregation would probably not do anything about it either because the incident happened in the past and the brother is trying to change for the better and it's best to let things be, that is, if he even admits to committing the crime).
4. I would have organized regular shepherding visits for her and her family to comfort them and pray with them.
Your #5 is highly specious. Every witness (including elders) I have ever talked to say "We don't need therapists or psychologists, we have God's word to help us through the tough times!"
By the way Matrix, you forgot to warn the girl not to tell anyone else in the congregation about that incident and to leave it in Jehovahs hands because he would take care of it in his own due time.