What is a diet that a 15 yer old can go one that will make her a size 9 with big bones?

This is for my friend. She has gone crazy because she thinks that she is to fat and no one wants her. The only way I can boost her confidence up is

If she loses weight. She a size 15 right now . She has tried to make her self throw up befour but I stopped her. I don't want to lose her and I'm worried that she is gonna try and hurt her self so please help. Thanks!What is a diet that a 15 yer old can go one that will make her a size 9 with big bones?
you're nice to help your friend.

she shouldn't mess with diet since she's still growing.

have her cut out snacks, high fat and sugary foods.



go to the gym with her and exercise to help your friend, talk is cheap.