Is my kid right?

My daughter is very self conscious about her size. She does sports and is very active. She is a 5'2 8th grader weighing 112. I just need to know if she is overreacting or if maybe we should watch it. I'm not the kind of mother that thinks my child is fat, but I think that if she is being bullied for it I can end it somehow. Are there any doctors on this site that have some words of wisdom for a struggling mother? Please comment