Angry 9 year old

[lessangermoresmile]

Does anyone have any advice/ideas on how to cope with an angry 9 year old girl? There is nothing I can pinpoint as the cause of her anger. She's constantly berating her older (12 year old) sister, she's rude to us, she can't stand her classmates, and I'm feeling worn down. She gets inappropriately angry over small things - e.g. being asked to put milk back in the fridge. We are all treading on eggshells. I wonder if part of her problem is that she has decided that rage empowers her. It makes everybody stop and stand back and gives her a great deal of attention. I try ignoring it when I can but it's the kind of behaviour that is hard to ignore! We have a points system in place where she gets a point every time she tries to control herself, and when she doesn't she is supposed to get a point taken off - except that when that happened, she took the chart off the fridge and hid it. I just don't know what to do. Has anyone any experience of counselling and how to go about getting that? Not sure if that's the right thing to do either! Help!