The picture is for "picture" purpose only and that is why she can wear slippers in the kitchen. I really doubt she worked as dishwasher that week-end. I worked at more than 10 restaurants and I know what are wrong with the picture.
1. Dishwasher use gloves to protect their hands.
2. Dishwasher use plastic aprons so they won't get wet that easy.
3. No one work at kitchen can wear slippers because of safety concern. The owner and manager will get into big trouble if the health department find out.