Girls are worse than boys I think. DD is at secondary now and so far, so good, but some of the girls she was at primary with were the biggest bitches.
In fact last week, we had an episode with one of them. DD had asked to borrow my mobile to txt someone, because she had no credit. She txt this old primary school pal, just for a chat and the message came back, on my phone, saying 'piss off bich, I've got new friends now!' Unfortuantely for the girl, I txt back, 'This is Mo's phone, Mo's DD is not here, please don't txt her again. Oh and btw there is a 't' in bitch!'
Good on your dd for rising above it. They are clearly jealous and when it happens to them, it'll all be old hat for your dd!