Should I make a lying guest feel uncomfortable or let it lie?

An American booked two weeks of the prime season here (rural France) months ago and cancelled two weeks before arrival with full refund. Entirely her right to do so. However since it was pretty short notice and I was in the last stages of installing a portable AC unit just for her group, I did message her about it. She explained she had to take care of a family member instead, fine end of discussion and have a nice Summer family comes first right? Since our town is tiny, I have just learned she stayed in other Airbnbs on the exact same dates. I checked her profile and she has reviews from other hosts. Part of me wants to call her out on her lie, in a humorous manner, because lying is morally wrong and she should be a better person. I know it’s petty. I didn’t get another booking because people tend to plan their holidays further ahead around here.