From Experience i'd say all of them
you need (or Your Mom) to know your limits on what you can or can not eat- I am allowed so many carbs per day and while Disney can't give you a carb count on foods most things you can estimate- Like fries in the non Disney world has this many carbs so those at Disney have about the same-
I can eat ANYWHERE at WDW as long as I watch what I eat and know what I can or can't eat.Not only am I diabetic but I am allergic to wheat and gluten - eating at Disney is a joy!!
Also when you call about your ADR's tell them that there is a diabetic -
2 of my fav places are
Epcot Toyko Dining I can get chicken breast and steamed veggies-no added sauces- They give me rice but I only eat a bit of it-
MK Crystal Palace has awesome salads & chicken and will make you a sugar free dessert-
I carb count and take into consideration the heat and walking
Some days I am good and others I need to down a powerade

to raise my numbers.
I would also email the special diets team and get info from them on Sugar free foods available-
watch too many SF foods ESP. while in the heat- It can cause upset tummies
HAve a good time!