Thanks for all the attempts everyone. The search continues. You’re correct, Zipper; she doesn’t like anything too squishy because she has a hard time getting up. My neighbor’s dog is elderly and he said I could have the bed if his dog dies first, so it’s a race to the finish. I bought a pretty expense bed online that she won’t touch, but the cat loves. The search continues.
Take a look at these. There are three different sizes and shapes, all very reasonably priced. They are cotton-filled, which packs down with use, and have sturdy twill covers.
They have wholesale prices, so they might be willing to give you the name of a distributor if you really want to see the product first.
I’d get the one shown with a high or very high density 1" or 2" foam pad under it; you can get the foam at high-end fabric stores or upholsterers. (I have a high density foam mat that I find very comfortable for my aging joints.)
I believe this might do the trick, thank you j666!