Yes I agree with Nancy, health risk with runts are common and the hair is very short for their age.
I have no experience with Chocolate Yorkies. I myself prefer the traditinal color. If she is a breeder I wonder why she is so willing to just give you a pup and not charge you for it. I wish I had a friend like that.
Do you have pics of the other Yorkies that she owns. Is it possible that one of them are mixed?
Here is a thread on Chocolate Yorkeis from here on YT that may be helpful:
http://www.yorkietalk.com/forums/gen...e-yorkies.html