At the buffets, dinner shows, or family style, no, you will not have to pay anything for her meal. If you order her a drink, you may or may not have to pay for that. At places with an a la carte menu she can eat off of your plates for free but if you order a child's meal or anything for her, you will have to pay for that OOP. Same at CS though you could get her a side at a CS with a snack credit if you wanted more food.