Welcome to YT. I sure hope the vet has some good news for you today. As far as I know, only 1 person on here has had a "blue born" Yorkie or atleast is familiar with one. Everything I have read online about them lead to serious health problems. The loss of hair may not be due to neglect, though other things are. I have read that they are usually in a lot of pain. If you go to google and type in "blue born Yorkie" you will find info that may help you with some issues this poor little puppy may/does have. I don't want to list them, it is something you will want to read for yourself. Please post after you get back from the vet.....hopefully there is a little miracle in store for both of you. By the way, did the "rescue" person explain ANYTHING to you about the health issues of a blue born? I pray the little girl will be able to lead a healthy happy life with you