There are "rare blonde" yorkies on the site. I don't personally have issues with off colors, but the term "rare" as a marketing term bothers me.
I agree that the quality of the dogs in the pictures is questionable in regard to YTCA standards, but if that is not a big issue to you as a buyer, then thats your business. If you are looking for a pet quality dog, and she is a responsible breeder, then go for it. I just see a couple of red flags that might turn me away personally
I would definitely ask to see the parents though, no matter where or who you purchase a dog from.