Dude, I agree. I don't think zanpakutou with multiple shikai abilities should keep developing unto infinity (even Byakuya's bankai only has what, three forms?) but I don't think three is too much, especially if she had the first two back when she knew him.

If she does have a third dance, I'd like to see something a bit sharper and nastier. White moon and white wave/ripple are terrbily awesome, but they're not what you'd call subtle.