Books, magazines, SUDOKU!!, other brain puzzles (like a Mensa book), card games... have you tried something portable like a Gameboy? Is there something she's wanted to learn about that this down-time would be good for, like politics, history, cross-stitching, etc? What about scrapbooking? If you keep it simple, it wouldn't get too messy. Maybe even do something charitable, like writing letters to soldiers serving overseas? I can't remember the company that handles those, but I'm sure an internet search would turn something up.
I hope those ideas help a little! I've had friends on bed rest before, and it's not fun!