My daughter spends two days a week at Grandma's...

My daughter spends two days a week at Grandma's and I pack her a lunchbox to take. However, lately she isn't really eating much from it (basically just the sandwiches, banana and yoghurt) and I'm not sure if its because its always the same stuff or if Grandma just doesn't approve of the other stuff so is giving her something else. It usually contains crackers (some plain some flavoured), raisins & dates, biscuits (plain) and a fruit stick (a muesli bar type product but with less sugar). What other things should I put in so that there is some more variety?