Dumb Co-Worker

Since Mother's Day is coming up, Baskin Robbins has to have 50 back-up cakes by then. We start on the first and all of the back-up cakes have to be done by the tenth so the remaining days can be spent on the cake orders. However, like Valentine's Day, I have done most of this myself. All week I have been behind because my fellow cake-decorator has hardly helped me at all, that on my days, not only do I have to do my cakes, but catch up on hers as well. I FINALLY had everything caught up by the time I left on Monday. But when I went in today, she hadn't done ANYTHING! And I really do mean anything! So, today I started off behind again!! I was really pissed off and let me boss know how angry I was. He said that he had already talked to her about not getting anything done, but I don't know if that will solve the problem or not. Some co-workers are just worthless!