A.M.
Well since its in home I assume they have a microwave? My son loves breakfast sausage links anytime of day. Rice is great too. You can buy the rice cups or make the flavored Lipton rice the night before and put in fridge. Kraft Macaroni cups are good. Canned veggies. Crackers,sliced turkey and sliced cheese. Mine LOVES the rotisserie chicken from Boston Market. Meatloaf tastes great heated up too. YOu can make it or buy it from Lubys or Boston Market. A kids plate is $4 and it comes with 2 sides and drink. You can buy it the night before so the daycare can heat up at lunch. PBJ's. They have the frozen kind that are to be thawed out before eating. I think they're called Crustables or something like that. Lunchables.
Mini Ravioli. Chicken salad made with basic shredded chicken and mayo. Fruit cups. Sliced hot dog weiners(make sure she slices them longwise)...you van buy the bag of frozen nuggets and fishsticks for her to put in micro or oven for him. Pizza is good heated up too. You can cook it(or order it) the night before as well. Or you can even cook it in the morning...buy the packaged kind, put in oven for 15 min and package up a slice or 2 cut up in little bitseize pieces.
If there is no microwave and you have to take only cold foods then I guess you're pretty limited. :/