You don't know if that is true though. I've seen an updated peice today where her mother has said she has been cooking quite a lot with chicken and turkey and her daughter sneaks out to eat with her friends and is very secretive about sneaking food.I'm not so sure that she needed more "help" on her return to the UK, insofar as if she had been in charge of her own budget and food choices, she might've been ok?
What she obviously didn't need was active hindrance from someone (her mother) controlling her food choices and refusing to buy anything other than quick-to-fix junk food.
So we don't know which one is telling the truth. The mother who is the adult, or the girl who could be making excuses. Either way, no one gains 22 stone in a year just by eating fish and chips or a few take aways. So even if this girls mother isn't always providing healthy meals I doubt shes forcing her to eat that much food.