I think
Scratch has some humanity left inside her. Perhaps, more than we want to give her credit for. A beautiful person who's had to live/grow up in a very difficult environment. Fear = respect. And her gender being a huge disadvantage against her, she's had to be twice as mean. I've always had a weak spot for the bad guys/gals showing their human side. I root for that side to win. They can still have their moments of jerkiness, but I want them to be good people in the end. Even if it kills them.
That said, I do not hold out
hope that the zombies realize they shouldn't eat other people. I say shoot 'em in the head.