I am confused - is she your mentor or your boss? In my company just because you have seniority does not mean anyone reports to you, etc. You mentioned you went over her head so that is why I ask.
If she is not your boss then I would move on for sure. She doesn't seem to have much interest in being your mentor. If she is offended then that is her problem.
If she is your boss then HR is your next step, IMO.
I have to agree with biminiblue, keep it professional.