I have a question...

I'm sorry but this is a spot for those applying to universiteit to be a doctor, not actual doctors. The advice spot may have been a better place to post.
Does she eat alot? Does she skip alot of meals? Are u sure she hasn't been ill recently? If u realise that she hasn't been eating alot, and she is skipping meals, then i suggest that u should tell your parents. Anorexia is a serious illness and if she does have it she needs help, before something bad happens. I hope this helps, and i hope if she is anorexic that she gets better :) heres a website that may help link