I'm so glad she's doing better, and the comfortable carrier is the best invention ever. I have mine set up on bookcase ledges in hopes they will also become portable kitty dens. Spot has slept in his off and on, especially during the winter. And Shadow went into his and had a nap. Dufus has to be stuffed in, but that zipper top makes it a lot handier. (Buster can't be wrestled even into a collar.)

If they treat it as a portable den, it also adds to their sense of security, especially if it's lined with nice soft stuff. And consider a secondary lining consisting of ratty old T-shirts etc that Smell of Mommy. They seem to take comfort from it.