In all seriousness, 13 is way too young to even consider that medical procedure.When I was 13 I was 4 foot 4 in a 36dd. I didn't get bullied that badly. Most dr;s would want her to wait till she had gained her full height, if she is heavy set(didn't look to be by the pic) they would encourage weight loss, and excercise.
Doctors should be looking at it at all angles, health, fitness, height/weight proportion, breast cancer caution. Unfortunately, children can be nasty at certain ages. I truly empathize with her situation, but the dr's will tell her to wait.....