10 stores later not one dress fit her- My Teen hates the way she looks..?

Oh my god I know exactly what she's going through; I was much much bigger than all my friends from when I was about 13 onwards, I comfort ate as well but all my friends were just naturally tiny, small and slim. I was popular but i was kind of labelled 'the funny one'. I refused to wear make-up and do my hair or anything girly like that until i lost weight because i didn't think it was worth it when i was big, i had no self-confidence at all. the thing is on the high street no dresses or anything pretty is available in bigger sizes so you just really sort of think 'oh... well its not worth it then.' the thing to do is not set a really unattainable weight or goal, just say or talk to her and try and get the idea into her head to try and lose a little bit, like maybe a dress size or something, just one at first, then she'll see how amazing it feels when she's lost the weight, and buy her some new clothes in the new size :):) and when she's got them on she'll be thrilled and FEEL amazing! then say to her try and lose a bit more, and a bit more.... just y'know, remember to do it healthy, don't make her anorexic.