I'd be against any state interference with religion (which is the parents' provence at that age), barring issues that actually involve physical or mental abuse of the child. If the child came to a teacher and said, "I hate wearing a burka" (which isn't required, as I understand it, of young girls, only post-pubescent ones), then I would take up the child's right to protest against the parental edict, but that's the child's right, not the state's. The state has no business making a ruling like that.