What can happen if my upstairs neighbor had a friend park in my driveway, she was parked illegally on the sidewalk and I backed into her car?

I tried knocking on the door. No one would answer. She had the ability to knock on my door. She called the police. He did not consider it a hit and run. She is claiming she won't go after me for hit and run piece. I told her to call my insurance for damage.