How about making a nice wooden box with sides ( maybe 12" or so). Then just getting a bunch of towels or blankets from Goodwill and letting her nest in them. You can just toss the whole lot in the washer whenever you need to. You can always coordinate the colors of the bedding with your living room if need be. If she has a bladder problem you could put a scrap piece of linoleum on the bottom of the box,easy to clean.