That sucks to read your girl is in the condition she is and if indeed the breeder did what you suspect, shame on them at the very least. As far as the pinky goes, I wouldn't leave it much longer than overnight. If it hasn't been eaten by that point, you could euthanize it via cervical dislocation or a sharp flick on the head to kill it and then freeze it for a later attempt at feeding. I would not offer it or the other pinky to your established collection once they've been offered/in contact with your new arrival. If the breeder treated that animal in the manner in which you suspect, I wouldn't count on their husbandry practices being up to par and why risk exposing your other animals to something if that new girl is a carrier? I would keep an eye on your new girl for a possible regurge but hopefully that won't come to pass. If it doesn't, I would try small live prey such as mouse crawlers or fuzzies even; that might stimulate more of a feeding response than what does a pinky, given how lethargic and inactive they can be and such a small heat/prey odor signature from them versus a slightly larger prey. Good luck with her and I hope she is and stays healthy for you and takes to feeding with no trouble.