For soup, I freeze in muffin trays to make larger soup 'ice cubes', then put in a freezer zip lock and suck out the extra air. Then you can take out as few/many as you need and they fit easily in a bowl. Do you have any experience canning? Canned soups that are soy free are nearly impossible to find, but you could pressure can homemade and then it would be shelf stable.
As far as washing, I know it isn't the most environmentally friendly idea, but I kept paper bowls/plates at school for when I was sick and wasn't able to wash plates - then I just had to wash my silverware.
Another thing that you could consider is dehydrating some of the foods. Check out some backpacking cooking websites, there are ones that have made from scratch recipes that you then dehydrate, and rehydrate with boiling/hot water. Would make storage easier, or even just be good for some 'emergency' meals if she couldn't get fresh food because of weather or something.
If you can find safe canned chicken, it isn't bad at all as long as you doctor it up, and the small cans are just enough for one. Good mixed with a safe BBQ sauce or buffalo sauce. I usually kept a can of chicken around as an emergency food - I'd mix with some bbq sauce add cheese and a tortilla and microwave for a BBQ chicken quesadilla.
If you can find safe summer sausage, my brother's favorite lunch is crackers or flatbread, sliced summer sausage and cheese. No cooking, has protein, and relatively healthy with some fruit or veggies added for a side.