I know a lot of non-Muslim women who wear headscarves, actually. The Queen, for example. And my mother, when it's windy. (She's definitely NOT a Muslim.) Back in the 70s I wore one myself, tied peasant-style at the back of the head, as it was very trendy at the time! I think this is a bit of a stunt but if this teacher wants to wear a headscarf I can't imagine what the big deal is!