My DD (@ high school) likes to take wraps, salads or even cold leftovers. We have these salad boxes with an insert for salad sprinkles, dressing & cutlery, so you can put anything in, really, and it still comes together nicely at lunch time. Just make sure you include enough calories (by including protein, nuts, oil-based dressing) or she will be ravenous. Another thing some of the girls at school eat are various combinations of fruit salad, yoghurt, muesli etc.

Would your DD be more inclined to eat sandwiches if they were on rolls, pitas or bagels? Worth a shot,

I haven't given my DD money each week for canteen but she gets pocket money so she can spend it at the canteen if she wants to.