My Daughter is so disappointed with weight.?

My Daughter is 12 years old. She hangs out with the..'popular' children. She comes home every day and cries because she thinks she is just completely (obese), which she isnt really, but she weighs 135 lb. and is 4'8. We have tried everything from Weight watchers, South Beach, Atkins, EVERYTHING, she ecersizes everyday, she jogs 2.3 miles, she jsut cant lose the weight. And she is just SO depressed that all of her friends are skinny....