Have you discussed with her the idea of advocating with her doctor for a change in meds if she feels her current regimen isn't working for her? or is too complicated for her life? (I know I personally don't do as well with meds that require multiple doses per day. I am very forgetful.)

What about other ideas that would help her keep track of her meds? Does she use a pill box? Does she keep her meds convenient to the time/place she takes them? Are the visible? Keeping a calendar might help so she can have an easy visual of the days she has taken her meds. How about a wrist watch with an alarm to mark when it is time for her meds, or setting a daily alarm on her cell phone.

Does she like to read? You could suggest some helpful books on Bipolar Disorder, or something more general but helpful.

I think what you're doing so far sounds really great. We should all be so lucky to have such a friend supporting us!