Rechu, when you go to the vet talk to him about a low dose of Prozac for your older kitty for a few months. It might help settle her.
Years ago my kitty developed kitty dementia. We called it cat-hiemers. He would lose track of where I was and scream looking for me. He also lost his hearing so calling to him did no good. I found if I stomped my foot on the floor he could find me. That is obviously not going to work for your lady.
Could you crate your dog at night so kitty could be in the bedroom at night?
Let me think on this some more, maybe I can come up with some other ideas.