Since Christmas my dd has begun to behave in a silly way with her friends/classmates. I want her to have fun, but when she is with her friends, they all start talking in high pitched 'pretend' voices, squealing/jumping/running and getting completely wound up. A bit of this is perhaps typical of the age, and I don't mind it. But, it goes on and on and escalates to a sometimes obnoxious level. She willfully ignores any adult requests to calm down, and when I've finally got her attention, her attitude toward me is disrespectful and dismissive.
It seems that sometimes this behaviour happens in school too. She was devastated yesterday to be scolded by the teacher 'for not being sensible'. She's a good girl generally, academically able and has good social skills. This behaviour only appears when she's with friends. She seems to be easily led by others - or perhaps they egg each other on until only a fairly heavy reprimand will call a halt.
Does this sound familiar behaviour to anyone else, and if so, how do you manage it?