I may be wrong but the tail twitching and fur moving may be her trying to spray. If she wanted to that would be what it looks like. May Bob will do the same thing and he will move his back feet at the same time. Someone saw that once and said that he was trying to spray. I also just saw a show on cats and the showed one spraying an area. Bob does exactly the same thing but he does not spray, thank God. Anyway, that is my guess on that.

I have no idea on on way she is losing the fur on the tip of her tail. Hopefully some one else will have a clue on that. You amy also want to give you vet a quick call, they may have an idea. Calling them is free.