I, too put the hijab on and took it off a couple of times before deciding to scrap it altogether.
Tell your friend that if she is only wearing the hijab to please her family/community then this is the wrong reason to wear the hijab. It should be between oneself and "god", not to please one's parents/spouse/in-laws, etc. this was the reason I used with my ex-hubbie who is a practicing Muslim and he couldn't argue against that.
Great, i'll tell her that tomorrow.

@Jila: I'm pretty sure it's both. She's always like 'i don't care about what people say' But thats not true. I do think that she believes the whole 'playing with the hijab' thing.