We too have shared meals with my DD9 while on
DDP and it's worked out fine for us. This year, DD will be turning 10 during our trip so she'll now be an adult and have full choice of meals.
That being said, she'll probably want to order a few of the kid's meals (she loves chicken nuggets and doesn't get to have them very often) and when she does I will pay OOP and save the credit.
Many of the TS restuarant have varied choices. For example Kona Cafe offers kid's these 2 complete meals-
Grilled Fish of the Day served with whole-grain pilaf, veggies, and yogurt parfait $7.59
Grilled Chicken Strips with macaroni topped with marinara sauce and mozzarella, served with veggies and fruit salad $7.59 My DD really likes this one.
My DD was allowed to order whichever 2 sides she wanted with above meals.
As well as the complete meal they offer Kid's Picks that so they can put it together they way they want it. And notice that if the kid's pick this option, they get an appetizer, unlike us adults.
Kids' Picks
Choice of 1 appetizer, 1 entree and 1 dessert - $7.59
Appetizers-Chicken Noodle Soup OR Garden Salad
Entrees-Hot Dog OR Hamburger OR Macaroni and Cheese
And if you eat at one of the signature (2TS) options, the choices are even better. For example at Grand Californian
Appetizer-Romaine Salad - Buttermilk Ranch Dressing and Sourdough Croutons $4.00
Entrees
Housemade Macaroni and Cheese - $7.00 or
Roasted Salmon with Basmati Rice and seasonal vegetables $8.00 or
Oak Fired Rib Steakwith Yukon gold potatoes and seasonal vegetables $11.00 or
Grilled Chicken Breastwith Yukon gold potatoes and seasonal vegetables $9.00 or
Homemade Whole wheat Pizza with Provolone Cheese - $8.00
DESSERT - $3.00
Crisped Rice Sushi Plate
Chocolate Pudding with Whipped Cream
Vanilla Bean Ice Cream with Chocolate Fudge Sauce
All meals with choice of 1% milk, bottled water or juice
Granted, it's harder at CS to get better choices but we frequently shared 2 adult meals between the 3 of us (DM, DD, and myself).
HTH.