Answer:
1. Carry a larger bottle of water (not plastic)
2. Put the egg in the sandwich??
3. Clean up with the materials she bought her lunch in.
4. Keep the unused/clean materials to clean up with next time.
5. Put the peanuts and the banana in the same package.
6. Just bring one larger drink (not 2 small bottles of water and a 250ml carton of orange juice.
Not sure if they are all right, but this is all I could think of. :)
