its very good you came to this forum, the people here are very experienced with yorkies and have helped me so much,also another tip,there is no such thing as a teacup anything,anyone using that term is not a reputable breeder. Just though you may want to kno since u said something about a teacup
anyway,you have been lucky there are no probs getting them so young, as far as the white,may bailee as a lil but it is slowly fading to tan. She has akc registered parents so I kno she is purebred,maybe it will fade like hers...make sure you have a healthy pup and ask about genetic issues since you arent getting her from a breeder.(breeders usually screen for these things)Personally I think $800 is a bit much without champion lines or anything.Will their be any health screening?