I am at my wits end with my daughter! She is 11 and her behaviour is shocking at the moment. She is always moody, angry and so rude. She refuses to do anything we ask. She doesn't like going to sleep and screams she is not tired at bedtime. She sits in her bedroom all day won't even come down for food. She is refusing school and is just generally angry at everyone. I am at a loss on how to help her