Hi Natalie,
I'm a stay at home mother of 10 (25 down to 4). Plus I'm a distributor of health products that in the last 3.5 years I've found to solve many everyday-family-related problems.
I'm also not all that far from you...we live in Eau Claire, WI.
Has your doctor mentioned anything about an enzyme-delivered multivitamin daily? Possibly your daughter physically is not getting truly fed from the food she eats? Would her snacks, etc. have sugar in them? A protein and vegetable based diet for a couple of weeks would stop those cravings.
You're so wise to be seeing this happen and seeking wisdom regarding it so early in your daughter's life....so many parents just let habits run throughout the child's teenaged years.
Hope this helps.