Instant oatmeal. You can portion it out in baggies and add raisins to one, minced candied ginger to a second, apples or pear to a third, etc.
Canned spray cheese.
Crackers.
Granola bars.
An unbreakable jar (Nalgene?) and lid that holds about four to six ounces. She can put lentils in water in the morning to let them soak all day. Come evening, she can mash them into a patty to fry or cook them straight--they are very fast cooking when soaked all day.
Nutella.
Tortillas. Lots of tortillas.
You can get peanut butter and almond butter in single serving packets now.
Extra dried onions.
Tabbouleh. Couscous, olive oil, lemon juice (I've used vinegar), dried parsley, a tiny can of sliced or minced black olives. It's better the second day, and if you have any left for a third day, you mash it into the lentil patties.
I like those little disks of red-wax cheese Baby Bell, or something like that.
Sardines.
Bunches of condiment packets--honey, duck sauce, sweet and sour sauce, lemon juice, mustard, mayo, salsa...anything you can gather.
A can of chicken, two and a half chicken-cans of water, a cup of instant rice, and a packet of condiment makes a meal. If the condiment is salsa, you can wrap it all in a tortilla to eat.