Have you looked at this thread?
http://www.yorkietalk.com/forums/pup...uy-yorkie.html
Very useful info for telling the good breeders from the bad.
I personally would not worry about the flea issue unless the vet said she was not treating them for fleas at all. You can get fleas practically overnight even in indoor dogs. I live in TN and fleas have been terrible the past few years, my vet says they have developed a resistance to most flea medications and he often has people complain of fleas even when their dogs have been treated.