In a dangerously large area like that, it's harder to say 'it'll show up' like most of us say when one escapes in a home..
Hopefully, she didn't crawl in that hole, or she's a goner. Check in cabinets in the room, and if there are any fridges, check around those.
Look under carpets, and behind things near the cage. She probably did not go too far.
Baiting, with a thawed out frozen mouse or rat, would actually be a good idea. Leave it overnight (when the snake is most active) and see if you can create a trap for the snake to curl up back in her cage.
Good luck. :[