Update 5/31: I did get a call from the director of that shelter. I now know which vet she was "spayed" at, and the director put in a call to that vet to find out what's going on. Hopefully I'll have some answers soon! In the meantime Abby's doing fine, still in heat - she's so cute the way she "creeps" along the floor and wiggles her butt whenever she's spoken to !!