Her dogs may not have issues, but what about their parents, siblings? It isn't just health to be concerned about, also temperament.
It is a tough call. The pups are here. I wouldn't buy a pup from her, but would cover the costs of the pup for the first vet/shot visit, otherwise it is just supporting a BYB. If you are concerned about health due to prior experience, do some research and begin talking with responsible breeders. They will know their dogs, the type pups they produce and will have done the needed testing.