im not sure there's much you
can do... unless she's dangerous to herself or others.
has she told you why she doesnt want to see her psych?
i mean speaking from personal experience, it might be that she's resentful about having to take the meds. and feels that shes "crazy" because shes on psychiatric medication.
maybe sitting down and talking with her, will help her come around? just like express the fact that you dont think shes "crazy" (even if you do, ha), but just think she'd be a lot happier if she was on meds.
i know it can be frustrating. my mother is also bipolar (as am i), and its unbearable at times when she's not on our meds. and of course shes said the same about me lol. i hope everything works out for you. good luck