It's all about calories, and lots of them so feed her plenty of healthy calories. Bread drenched in olive oil will set her on the right track. And look at all the calories in yogurt. Sweetened it tastes like dessert. It's not that hard to eat a whole 16 oz. carton. Start by looking at a calorie chart, choose the healthiest foods with the most calories, find recipes that feature them, start cooking up a storm, and then experience the thrill of watching her grow.