Almost everthing I vape is VG...
I think this may have something to do with it. VG has a tendency to leave a slight residue on things. If you have a VG liquid with a fairly strong flavor it might leave enough of a residue for her hyper sensitive sense of smell to pick it up. Women have a naturally stronger sense of smell and being pregnant her senses are pushed to their limits. At this point you neighbor two miles a way could fart and she can probably tell you what he ate for lunch. So I would say either switch out to PG based liquids for the next few months or simply step outside to vape and keep your juices and cleaning rag in a part of the house she doesnt go near. Good luck!