So today at school, while looking for parking, a car was pulling out and another car was waiting for that spot and I was in front of those car waiting for them to get their cars out when I saw the car next to my door start backing up, I went into reverse and started backing up to avoid getting hit, not to slam on the gas in case someone was behind me, and well she hit my car's right side bumper getting it some scratches and causing the bumper not to sit flush with the headlight and fender. She said she was willing to pay for it if we didn't get our insurance involved. So I got her number and license plate and left. Now she is calling me saying her insurance company said its not her fault and that I pulled up behind her and that she has a witness to all this when she left right after the accident. SO no she wants me to decide to make a report, but if I do, it's going to be my fault. Which sounds kinda fishy since if its my fault she would claim it anyways. She says she has the witness's number and I asked for it but she hasn't sent me the number as I'm typing right now. So what should I do, is she trying to scare me out of making a claim stating it was my fault or is she trying to BS her way out of it.