I'm at the end of my tether, every day is bad with her at the moment. She has 2 younger sisters who she's constantly mean to by using bad language, hitting, kicking and pinching. She is such hard work and if something doesn't go her way she will end up grabbing or pinching me. I've tried to discipline her by with-holding pocket money and treats etc but nothing seems to work. She talks in a very aggressive voice most of the time. She has no interest in school work and how ever much I try to help homework is always a battle. I know inside something must be really hurting her to cause this behaviour but I've tried talking to her and nothing seems to be obviously wrong.
Please can you suggest any ideas to try and make life more bearable with her. She is making me ill by her behaviour.