Does she attend a public school? If so... Grrrrr!!!
I get soooo annoyed at public schools that try to enforce this bullsh*t. My son attended a public primary school, and his uncle bought him a wooden beaded necklace, and bought himself one... and they had this thing that they would both wear them always... anyway, my son wasn't allowed to wear his to school unless there was a religious or otherwise, reason for it... I wrote a note explaining that I wished for James to wear it and they still said no... yet, there were girls in his year, wearing dangly earrings, who I KNOW had no reason to be wearing them... I was pi**ed off at the double standards.
I hope your daughter wins her right to express her individuality... the local public high school here lets kids express their individuality... and I think it is a great thing to see
I've heard of this rule before in public primary schools, its RIDICULOUS. It REALLY gets to me, as well. Why allow girls to wear jewellery and not boys? It's insane.

The thing with public schools, is that they really can't *do* anything about kids not wearing the uniform, apart from whinge about it. I never wore my uniform, my mum wouldn't buy it (Because she knew i'd never wear it lol) and there was nothing that could be done. What could they do, suspend me? It wasn't my fault! I don't know if this is still how things are but that's how it was back in my day (which wasn't that long ago, i'm only 18).