I was diagnosed with PCOS years ago, and can sympathise. I didn't have much of a problem with excess hair, but weight gain was a problem. I have read that even if you can lose a small amount of weight it will help. I know it is harder, because of the condition, but I think low carb is best for this. But she should check this out with her GP first. I know it is difficult in a society where so much emphasis is put on looks. I think the best thing you can do probably, is do what you are doing, keeping her confidence up, praising her as much as possible and letting her know she is loved for who she is. I wish her well.