Maybe Ally just needs to be an only cat. Even in a room all by herself, she can obviously still smell other cats in the household, and her behavior problems at Julie's seemed to begin when Connor was brought home.

Some cats are just not happy unless they are "only children." I wonder if there's someone - maybe a newly-widowed or otherise person who has no animals, but would like another presence in the house - that Jennie could find ... some older folks are reluctant to get a new animal because they worry what would happen if the animal outlives them, but Ally is an adult kitty, and not likely to live another 15 years or anything, realistically speaking, so that needn't be a concern.