My Daughter is 300lbs 14 Years Old Tryed All Diets Should She Get a Surgery?

My daughter is really big 5'7' and really over weight 320 we tryed every diet. She is 14 years old stopped going to school because of teasing by peers due to weight. Doesn't like going out or talking to other kids due to shyness because of her weight.I feel like life is slipping by for her what should I do?Do you think surgery is the best option?