maybe you should just leave her for a while, everyone has ways of dealing with grief, hers is not eating, leave her for a few months, it will either stop as she comes to terms with the loss or you can take her to the doctors and he will tell yher that if she drops more than 15% of her body weight she could die, very quickly. she is coping with gried afterall, you can't not let her grieve, just let her do it in her own way for a while.

thats what i think anyway.... i know my bulumia got way worse after my grandma died.... she will be fine.