What is my best option to settle my case since the victim wasn’t calling me yet?

Hi, so I got into an accident about 4 days ago, it wasn't big and no one was hurt. All that happened to my car was the license plate got bent. But the other driver’s car had more damages because I hit her on the side, but I was going about 10 mph. So she got out and looked at my car, wrote down my license plate number and got my number. She asked for my insurance information and I told her I couldn't find it because I was driving my mom’s car at the time. My friend was there with me so she wrote down my number and gave it her and she said you'll be hearing from me and I left. It’s been 4 days and I still haven’t gotten a call and I found out that my mom’s insurance actually expired 3 days before the accident. So now I’m confused on why I she hasn't contacted me yet. I can defiantly pay for her damages out of pocket if she just calls me and now I’m thinking that my friend wrote my number wrong and that is why she can’t contact me. I’m guessing she will give my plate number to her insurance but her insurance company won’t find any insurance on my car. Can she go to the cops now and say I did a hit and run because she thinks I gave her wrong information on purpose?? Could I get sued?