From what other PC Bipolar Forum people are saying (I don't know you that well), I would say you need a new T. If she thinks there is nothing to talk about or work on, I suspect she is not that good. -OR- she could be a good T and you may not be totally open and honest about your WORST days. You can't just talk about how you're feeling now, you need to bring up your worst days to your T so you can figure out how to manage them. Same goes with being totally open and honest with your psychiatrist. That's even more important, to make sure you are being medicated properly. Make sure your pdoc knows when you are experiencing hypomania and mania, not just telling him or her when you are depressed, for example.
My husband had this problem with therapy: he wasn't honest about his worst days.

Maybe you should keep a journal so you can have some specific things to talk about. Seeing a therapist once a month is good for maintenance, now that you're currently feeling stable. Best wishes!!