How much time elapsed between when you saw her last & when you realized she escaped? Chances are she's in the same room her cage is. Place a large bowl of water on the floor in each room, they can smell it & before long will be searching for it. Close all the doors in your house,turn the lights off, place towels under the doors, go get a case of red bull & check the rooms about once every hour tonight, balls are largely nocturnal & she will be on the move tonight