I have the same dd6. Seems over the top to me a lot of the time with her attitude, out going nature, desire to perform. I correct her when she is being rude. I am pretty introverted so her desire to have play dates every day, talk non stop, jump on the coffee table and dance, and so on, does tend to be draining!
She likes ballet because she gets a chance to do real live performances from time to time, but it hasn't slowed her down.
I think she likes the challenge of the ballet dancing as well, but I am not sure she'd stick with it if not for the goal of a performance every 6 or 8 months...