You are not your mother. And history doesn't have to repeat itself. You like being a lunch mum? Then be one.
I loved it whenever my mum packed my lunch box. I still like having her cook and pack my lunch to work. Sometimes, when she visits, I specifically request she prepares my lunch.
Children love that feeling of having their mum take special care with the food they take to school. It's too bad your mum was weak to get through their childhood trauma. Don't be like her. You are stronger and wiser than she is.