I have a friend who has just left the mlm world of juice plus. She'd been avidly selling it left right and centre and saying it had cured her of her life long illness. She has now admired that it is all indeed just a con and she is not cured.
I can't absolutely understand in this situation you're willing to try it, but it's just a big con and this is not the thing that will help her.
My mum used to have major skin problem and started drinking A LOT (can't remember how much) of water and it cleared up. Obviously your dd is already drinking a lot of water so that probably won't help her. But there must be something. What sort of research have you done?