You are understandably upset that your daughter is being mistreated. Thats normal. Now separate your decisions from your emotions moving forward. Recognize that yout emotions may be clouding your judgement on the situation (like repeatedly refering to another 6 year old as a "little brat.") Don't dismiss the advice on here from others that you should probably focus your energy on helping your daughter cope with conflict in a healthy way. Get the leaders involved (teacher or principal) if it becomes a progressively hostile environment where they need to separate them more - only you and your daughter will be able to determine if that point has been reached or not. Ask you daughter what she wants you to do - e.g. sometimes getting the teacher or principal involved too soon may make her a target for additional bullying from others if she is seen as the "tattle tell," or a "weakling" with the over protective parents. Unless there is more than what you've told us, from what you've mentioned so far about the situation, either your daughter is overly sensitive and not handling the situation well, or you are overreacting and not handling the situation with enough maturity. You've responded with hostility to many well-meaning posters here - pleaae come back and read this thread (and your own response) with some introspection, from an objective point of view, when you've had a chance to cool down tomorrow, and the answer of what you can do should become clear.