M.W.
L., you didn't say if your daughter was overweight or was at a proper weight. If she is gaining weight too quickly or is overweight, I would be more concerned than if she was normal weight. I would suggest that you let her body condition dictate when you become concerned about her eating habits. Sometimes sneaking food is done because the child's body requires more than is being provided. Maybe her metabolism has become more active lately, maybe she is going to do one of those unbelievable growth spurts that children sometimes do. So I would let her body's condition tell you when she is eating too much. My son ate everything that was not nailed down all his life. His legs rubbed together when he was a toddler, though he was never above the 100th percentile in weight. He is adopted, so I didn't know the body types of his parents. Many people told me to put him on a diet. I let his internal regulator decide when he had enough, because he ate mostly good food. At around age 10, he had an unbelievable one year growth spurt and turned into a bean pole. Literally, he grow several inches and didn't put on an ounce. Today, at 23, he is a fit young man. Sometimes, you don't know what is going to happen. You are wise to consider your daughter's genetic make up, and to be concerned about the eating habits she is forming. Maybe you can't keep her from eating, but maybe you can form the healthy habits of more exercise so she doesn't become overweight. Just getting into the habit of taking a daily brisk walk in the neighborhood or on a walking trail will be good for both of you, it will also give you more time to bond together. If you make it a family thing, everyone will benefit. Just a suggestion, you maybe can come up with something yourself. The habit of exercise is good to foster, and will help her overcome any predisposition to being overweight. Hope this helps.