I understand your concern for your daughter, but as someone who has battled with weight issues for years I would advise leaving the girl alone. Also, don't bother with SW and WW and others, if they worked they would go out of business. They make a fortune out of making people, chiefly women, feel unhappy about their appearance and a lot of the food is processed crap. I went to SW recently, and yes I did lose some weight and have kept it off, but that was through eating lean meat, lots of veg and cutting out white flour. SW class was always about how to make a 'mock trifle' out of processed, artificial sweetened non foods, not good for anyone and they wreck blood sugar levels and thus increase food cravings. If she is getting ample, gentle exercise such as walking or cycling, is able to do what she wants to do with her family and hold down a responsible job then she is obviously doing ok. Yes, being overweight will have an impact on her joints, and it may be that which will cause her to review her diet in the future. Don't judge, don't comment, although I do understand it must be hard. I am not and have never been morbidly obese, more of a fluctuating 14-18, but would find it humiliating if my DM questioned my food choices when I am an adult, raising a family and holding down a responsible job. Just enjoy your lovely daughter!