According to some Pediatric sites a 10 year old female that stands about 4'7" should weigh around 80 pounds but please keep in mind that everyone is different. No weight is the "norm" for all. At this age she is still developing so she is going to go through many different phases before she plateaus. If she wants to do anything about her weight please have her see a Doctor first, otherwise enjoy being young it only comes around once... (: