26 is overweight, not obese (that's 30+) but i digress. i agree that the overeating seems to be physiological and could easily be self harm, the mom should get her daughter therapy and find out why she feels the need to eat consistently. it could also be that the daughter is insulin resistant and needs her simple sugars and carbs restricted in order for her natural hunger cues to properly work. i'm surprised that the dr never even looked into that, hiding snacks and being overweight in a thin family normally tip medical professionals off that something isn't normal. sadly my money is on the kid being abused at a young age and useing food to cope, it's too common to discount as a viable explanation and mother's often don't want to think someone hurt their kid and they didn't know.