They usually don't go horribly far from where they escape. Unless the tub was very near the door I doubt she left. Have you checked places that tend to stay a bit warmer, like going through closets where there's not a lot of air circulation or under refrigerators? You could try setting out 'bait' by setting up a heatlamp, a prey item, and a hide in the floor or something. That might lure her out.