Waiter helping herself to my food

Went to turn and tender in a Vanderbijlpark, after having a good meal I asked for the rest of our food to be packed in a doggy bag. And the waiter and gave us the food but helped herself to some. After giving her a good tip I wish I can go and retrieve it. Here I was being thoughtful and giving her a good tip on the other hand she cheated my mom and I. So disappointed.