Wow! I feel your pain. My wife has bipolar. It is not the same though the experiences may be similar.
1st of all, how or who did the diagnosis? It would seem that 8 years old would be a bit young to start having BP. However, being treated so young could help the rest of her life. I wish my wife would have found out a lot sooner than she did.
I would suggest finding a support group near were you live. I mean a person to person group. Stay here online too. This board has some very thoughtful people on it. Their advice will help you! I have been helped immensely by them.
Welcome to the board!