I would keep her and get new flock mates in the spring. After a mink killed three of my four laying hens last winter, Honey was all alone in her coop. She did okay, but didn't seem to get along with the Iowa Blues in another coop. I quickly let her return to her old, lonely coop. I bought two Salmon Faverolles chicks in the spring and let her get to know them free-ranging in the yard during the day. Now, Honey, Celeste and Camille happily live in the same coop and roost together.
I am sorry to hear about your loss, but it would be, in my opinion, a shame to give up on chickens. While she was an "only" bird, Honey became very, very people friendly. Maybe your girl will bond with you until she gets chicken friends?