I usually add a wheel or flying saucer to the playpen as well

And maybe a few more items - cardboard boxes are fine. With holes in maybe! But don't take the wheel out of her cage. That will upset her if she finds her cage wheel in her playpen as that's her cage wheel. Maybe a cheap trixie wheel for the playpen? Or a flying saucer. I think flying saucers are ok for temporary use
Trixie 20cm plastic wheel
18.5cm flying saucer