I say...get her well.....spay her.......and then sell her or give her to a very nice person that appreciates her size......
If she is not what you need in your program, and you are not interested in keeping her as a pet......then why not let some other nice family member have her to love on......I know there are a few on YT that might be interested in a "tiny" little girl......she is not going to be bred anyway....so why not???
Chaulk up the 1500 as lesson learned, and find a reputable Yorkie person that has the type of Yorkie you are looking for....
JMHO....
