Congratulations on your new little dog. Pleased to hear she's settling in well. But I'm quite surprised that she han't already been spayed, as with female dogs who have been used for breeding, the breeders usually arrange to have a dog spayed when it's of no further use to them for breeding purposes, and to prevent new owner's from breeding from the animal. It would be worth checking with your vet, to see if he can find any indication that she has already been spayed. Incidentally, how do your two dogs get on together.