Since she had champions, is she a member of the YTCA? Bc that's the yorkie breed official breed club. Go to YTCA.org and look at the list of breeders to see if she is there.
I'm so sorry about Neiman (that name is just precious) - he sounds like such a character, and sounds like he was your little shadow.
I hope you find your breeder, or that you're able to find another good breeder who can bring a little yorkie into your life to give you joy.