She must have no idea how many calories she's actually eating. Those foods are so calorie dense, it blows my mind. What the fuck is in that snack mix?  Have you ever mentioned that to her? Maybe it could actually help, although I highly doubt it- fatties love staying in denial, and it's easy to say "Look at how little I eat, but I'm still fat! I had a (1300kcal) salad for lunch yesterday!"