Hi, I know how you must feel about your daughter's happiness, but I must say don't feed into it, I mean, don't try to get her a diet, or more excercise or say anything at ALL regarding her wieght or how she looks, PLEASE believe me in that it will backfire and she'll develop an eating disorder, I know because it has happened with me. Don't think that it can't happen with your daughter or isn't happening because us teens can hide it extremely well for long periods of time. She is fine with the weight she is and is perfectly normal, her happiness needs to come from being happy with herself, what might be a healthy wieght for some can be dangerous and deadly for others, everybody's different.