It sounds like your little one has some special needs as well and there might be some previsions made for foods for special needs children . I don't know that but you maybe can call and see. I would not introduce anything new on the plane or on the trip. We have an allergy kid and food reactions can be very scary and you want to be home and not on a plane.....just in case. I would try to figure our the easiest way to take the foods she eats the best and likes the most. One idea I have not seen here is to take foods that need to be kept cool in a small cooler with ice, but dump the ice before security. After security, get ice from any restaurant and re-ice the foods. Cheese sticks, small pieces or meats, par-boiled veggies or fruit would work. Yogurt , pudding cups etc can often be found after security and added to your cooler.