Hi Kimber! From all the reading I've done I think it could be related because bipolar has a lot of stress attached to it and it's hard on your body. I have tentatively been diagnosed by my gp and am waiting to see a pdoc. I have been a tooth grinder/clencher since I was a little girl which causes TMJ problems. I've have ground my teeth down pretty bad. I get all kinds of other problems like lumps in my throat, and just generally feeling ill.
I'm very sorry your daughter has been diagnosed. It is a terrible illness and hard on everyone. I wish you and her the best.
Crissi