Given that I don't even know what a pump is, I looked for a definition and found this one:
Pumps are one of the most popular styles of women's shoes, and they're also one of the most difficult to define. In their most basic form, pumps have closed backs, and low-cut fronts that hit closer to the toes than they do the top of the foot.I leave it to you to decide whether Penny seems to be wearing pumps: Pawz shoe, which looks like nothing so much as a deflated balloon, folded itself around her foot. It seems that as the rubber ages, it gets kind of sticky, like old balloons do. Whatever the reason, Penny finds the shoe comfortable and it protects her foot.