tell the insurrance company.
1. indeed she didn't stop after accident (hit and run), evidence. she did stopped later on and exchanged insurrance.
2.details of the accident (your left rear) and her front right)
3. The ramp is one lane. both lanes should make effort to avoid accident. there is no such that you merged into her lane. her claim is BS.
4. threaten her & insurrance company by going court. worst case, going court. can't let the b. to get away like this.