Sexual Assault and rape of a minor

I need some help. A level 2 Autisic individual (now 23f) told me how her neighbors son took her into the woods and raped and sexually assaulted her multiple times when she was a minor. She said he also used to masturbate to her through her bedroom window outside and came into her house and assaulted her once. She tried to get help and told her neighbors (the parents), but they called her a liar. She never reported it.

These people are very dangerous and continuing to maintain contact with her. I am scared for her.

What do I do?

Location: PA

Author: Coldishbananapie