You should be worried for sure! That's an obvious eating disorder. You don't have to witness her throwing up or binging to know that. Her metabolism rate is extremely high. Whatever she eats, it isn't turned into fat. Watch her closely, and always be there to talk to her. I suggest going to the nutritionist and seeing if he/she could prescribe a certain diet. such as a high protein diet. and as for the pinching the thighs thing: all teens go through some sort of body image issue. just talk to her and possibly get her into some consuleing.
