I am sure that the pup has ended up in a loving home, I very much doubt that the pup was chipped, in my estimation, she was weeks old. My partner who took her in said during her correspondence with them through out the week, them mentioned that the pup had Parvo. I would put everything I have on stating that the original owner didn't re claim her.
As you say though, as gut wrenchingly disappointed that I am, I am sure she is being looked after, I just hope whoever unfairly took her gets all their shoes chewed up in good time.