K.T.
You always hear people talking about the terrible twos. Well I have my own sayings. It's the tiresome two's, the trocious three's, and the furious fours. Kids go through all different stages in life. So this behavior is probably just typical for her age. She's gone through some changes and this is her way of coping with them. You just need to make it clear that when she acts out like that it is not acceptable behavior. Most kids who act out or throw tempertantrums are looking for attention. When my daughter throws a tempertantrum I walk away and ignore her. I won't pay her no attention untill she's calmed down and is resonable. This really helped, because she finally realized that throwing a fit wont get her what she wants. If she get's mean or violent then you need to intervine. I would suggest issolating her, by putting her in a room by herself. When she's calmed down you then need to talk to her and explain why her behaviour isn't acceptable. There's always the method of taking toys and privelages away from her when she acts out as well. Good Luck!