I'm so sorry - that sounds like a really difficult situation to deal with, on top of everything else. I would try to get as many adults as possible talking to her to convince her to change her mind. What if you introduced her to some people for whom medication worked? Do you have any support groups in your area for bipolar or a group for parents?

Given the kind of language she uses to talk to you, it sounds like it may be an uphill battle to get her to agree to this.

Hmm, here is another possibility - I have no idea if it would work for you or not. If there is a clinic that offers health care for the homeless or poor, you might be able to go in without your mother. The local hospital may have an option like that as well, that lets you pay out of pocket without your mother accompanying you.