Hello Shaunna and thanks for bringing your valued question to the Disney Parks Moms Panel, I just hope you'll have time to read my reply before leaving home for your upcoming magical visit to Walt Disney World Resort!
I can totally relate to your Disney dining dilemma as one of my own children is similar to your dear daughter and is also a picky eater and prefers grilled cheese sandwiches to choosing from a varied and at times unfamiliar menu.
Which is why I'm delighted to share that in our experience of dining in multiple Disney restaurants over the yEars, most will on request be happy to serve a simple alternative dish for example; plain pasta, PB&J or grilled cheese sandwiches.
Simply enquire with your knowledgable server at the
Rose & Crown Dining Room or
Chefs de France if there are any similar options available to order or if they have any plain food/kid friendly dining suggestions.
Wishing you an extra magical visit to
Epcot where I'm sure you'll make some unforgettable family memories.
~ Jane