Trouble making kid

Well I got a call from my ex at about 3pm mind you we still live together for a while longer. Anyways his daughter and my son get off the bus at 4pm. He told me that he couldn’t talk long but when they got off the bus his daughter was suppossed to go sit on her bed and stay right there until he got home no talking no nothing. So when she got home i tried to tell her she had to go sit on her bed and she blew up and gave me a big attitude. Anyways after a long argument she told me she hates school and hates me and hates living here…..Long story short in the end she ended up telling me the principal told her she cant go to school on monday (im guessing a 1 day suspension) She says she is not going to tell me what happened or talk to me because Im not her parent anymore and she hates me….I know her dad will tell me Whats up but whatever it is it most have been pretty big cuz #1 her dad sounded big time P.O.ed And #2 Our school district are kinda easy on the younger kids….it has to be something drastic in order to have her suspended.  So I will write more later but i know one thing for sure She is in deep crap.