This is just Fantastic News.

Bella is making nice progress. We kept the room unblocked while we were home in the evenings this week. She started coming out on her own and checking things out. I've been sick all week-end and haven't gone anywhere, so Bella has been free to roam all week-end. For the most part, she stays under a bed and sleeps during the day, then comes out in the evening and hangs with us. She's slept in bed with us a couple of times and one of those times there was another cat on the bed with us, but they did not bother each other. My old cats have done some hissing and so has Bella, but that does not bother me. Having gone through this with my other cats, I know that things will just ease up slowly until they completely tolerate each other. Right now, they mostly ignore each other. Bella has been eating good, running up and down the stairs-you can sure hear her coming! She's managed to jump up on the beds and couch a few times with no help needed, so that's been encouraging too.I don't plan on gating her off tomorrow-I think the cats are ready to give each their own space.