Try
Bipolar II, Mood Swings without Mania; Brain Tours; Stress and Depression; Hormones and Mood; and more... and the link from the NY Times in the stickies above. Both are excellent sources for bipolar information.
I wish you luck. But, her doctor is the best source, I would think, as s/he knows the person and the medication. Do not be afraid to call 911 if necessary for the safty of the patient or anyone else, either.
Shalom!