You may have found the
Festival of the Arts menus already - my mom has very healthy taste in food, as well, and she and I really enjoyed the mussels from the Craftsman’s Courtyard booth. Tangierine Cafe also has some yummy-looking chicken kebabs with carrot-chickpea salad. Another tip is you can ask them to “hold” aspects of the dish - like no creme fraiche on the soup from the Encanto booth.
There’s a Food and Wine app that is great for navigating Epcot festivals - you can highlight items that look like they might work (for them OR you!!

)and locate them on a map.
Good luck. I know it can be tough trying to satisfy “food police” at Disney! Been there! But I do second the opinion that you and your daughter should enjoy a character meal guilt-free. You both deserve to build those memories.