Know you have done the right thing in trying to make a difference in this little one's life
You are blessing this baby & her family just by having this pup with your family.
Maybe her owners will be more open to caring for her if they continue to come to meet-ups in your area. Also, I don't think anyone else suggested this, but maybe you could tell her about YorkieTalk!
I know this might sound crazy - but coming on YT actually makes me love my dogs more - or at least know I'm not totally out-of-my-mind because I love them so much!
I think YT helps so many who come here