I know this isn't answering your lunchbox question, but have you told them you don't mind if she eats her lunch at morning tea time? As a teacher, I'll often try to encourage my students to save their lunch til lunchtime, but if a parent told me they didn't care what they ate when, then I would let them go.....I know that my DD1 has a much bigger appetite in the morning than at lunchtime for instance so I wouldn't be surprised if she would want to eat her lunch at recess time when she starts school in the future....