I questioned you the other day about the age of this puppy. Please listen to what is being said to you. If you make an error in picking your puppy from someone who does not do it right from the very beginning you could be faced with very difficult challenges that could possibly last a lifetime. Truth be told, she would not have even been offering them for sale at only a few weeks old and allowing them to be gone at 8 weeks. To me it just shows that she is doing it for the money.
Maybe you should really seal any bought and ask if you could pick the puppy up even earlier~I'll bet that she would allow it. Then you will know once and for all that you need to really walk away.