Do Older Ferrets Do OK When Adopted?

I have adopted ferrets out to new homes. For most of the adoptions went fine except one adoption. Carol had adopted a tiny little boy from me and a couple months later she wanted and cagemate for her furry. So once again she came to me, I had the perfect little girl for her Dolly, I went to drop off Dolly and it look as they would be good friends. Then Carol phoned me 5 days later, Dolly wasn't eating and not playing either, she would climb out of the cage and lie in the middle of the room. I told Carol I would stop in later that day, when I got to Carol I was shocked to see a listless ferret lying in Carols's arms. I started to ask her what happened, when Dolly heard my voice up came her head and she literly jumped out of Carols' arms intomine. Dolly started dookering and kissing me. I had to take back home and everything was good according to Dolly, I guess she thought I deserted her, she is one that can never leave the shelter, she has been here now for 6 years, and still finds things to get into trouble with.