My seven year old daughter is so horrible to me and to her twin brother and older sister. She is good at school , but very head strong and even the teachers say she takes over the class sometimes. But im at my witts end with her as soon as i no she is coming home i know the tamtums and screaming is going to start. i repeat myself time and time again asking her to do or not do something, but unless its what she wants nothing will happen. i feel so sad and feel she cant be happy acting this way, and im getting more and more down in myself. I ask her why she behaves like it and she just says she doent know but gets upset, usually after we have really fallen out. its like she likes to upset me , but i just want to help her, but dont no who to ask as i feel im failing her. Any help will really be great.