HELP! My three year old is very badly behaved when with her friends. She bites, pulls hair, pushes, smacks etc, etc. The other kid always seems to come off worse. The behaviour sometimes starts because of a squabble over a toy but sometimes it's unprovoked. I have tried dealing with it in a calm manner, in a cross manner, in a firm manner but nothing gets through. To make it worse she tells me she does it because she likes it. I'm at the end of my tether. She's always been very willful but this is getting embarrasing.