It is definitely do-able and recommended. Indoor cats live longer than outside cats. We have had many feral cats which were turned into strictly indoor cats. When she moves, if she never lets the cat out, it will adjust quickly. If the cat tries to run outside, tell her to rattle a set of keys at the cat to scare it away from the door. It needs to fear the door. It will be way easier than she thinks. All cats are hunters at heart, but at 14 the cat will adjust fine and she won't have to worry. We currently have a male cat who was a feral tomcat (and a fighter). He lives with us in our MH and once he got neutered, he quickly adjusted to being inside. He behaved himself from the beginning and turned into a nice kitty who no longer fights other cats.
