Well, she is a cutie.  Ask the questions you want and need to ask the breeder.  Ask how old the pup was when the photo was taken.  Remember, it is completely normal to ask for a photo of the puppy with its mother since she is on the premises.  Ask where the sire is.  If possible, get a picture of the 3 of them together.  The pictures are small, but you can ask the breeder to send additional photos to your personal email.  Ask away, no good breeder will get tired of your questions.  Let us know what you decide.  Honestly, you can even ask her for the vet's number then speak to the vet about the health of the puppy.  I don't think $850 is too high or too low.  PM me if I can be of any help to you 
