I guess she's never had a bed before.
I put it on the floor near our bed where she likes to sleep, and she laid in another spot that night. Mark wondered if she was avoiding it out of disinterest or out of courtesy. Maybe she thought it was ours, so she politely stayed off it.
Right now it's on the floor near my desk; so is Dierdre, about a foot from the dog bed. Oh, well.
We're gently encouraging her to use it, but if she really doesn't want to, we won't insist. Perhaps this winter she'll find it appealing.
Front and back of the new bed.