As noted, in many other posts, check out the breeder and do not just go to one, visit breeders (responsible breeders) even if they don't have a puppy for your at that time… you will learn hopefully what is a responsible breeder is and how puppies should be raised and what to look for...
I can also say, that I suppect that she also is using a stud that she purchased and came from a Fox Terrier/Basenji cross in New Mexico area.... just judging by the pictures of the pups on her website last year.