I remember when both of you would race to the apartment....you to avoid her and her to get there before you left so she had more time with the girls and fix dinner etc. It would do her good to have to pick up the girls and spend less time with them. She would be the one hanging around your house trying to spend more time with them and maybe staying for dinner etc.
I suggest rotating the picking up and dropping off. You will have to come up with a reason so she doesn't think you are being snotty. I would say gas to and from.