Thank you so much!Here are a couple of new ideas: I did mention the Nurturecalm pheromone collar, which I think is a real winner. Whether you can get it on her, though, is another story. While I haven't found Feliway to be all that great, it is an alternative that might be helpful. Plug in a couple Feliway diffusers in her room.
For damage control, an item I found extremely useful is a product called ssscat, made by Innotek (Radio Systems Corp., www.innotek.net, Knoxville TN). It is canned air with a motion sensor top that snaps on. I used it to keep the cats from spraying on the front door (because they could smell outside cats). You set the can in front of whatever you want to protect and when the cap senses motion, it sets off a burst of air. Totally safe, odorless, causes no injury, and they will stay away from the protected area. If you are dealing with a behavior issue, maybe it's time for CC to get a little gentle push back.
If memory serves (which it usually doesn't), I believe the approximate costs for these items would be:
Nurturecalm collar - about $14 from Chewy
Feliway - around $20 from Chewy
ssscat - about $20 for the cap, and maybe $13 for the cans, not sure where to buy any longer and I was receiving a rescue discount from our local farm supply store.
I'm still leaning toward some kind of neurological issue, but that's just my guess.
I like the suggestion about a containment system right inside the room, and think the PVC plan would be a good choice for that. It goes together kind of like Tinker Toys. You just need to measure and cut the straight pieces.