If search the room that is kept in from top to bottom first. Does the room you keep her in a bedroom or central room of your home?

There is also the method of setting up a heat pad on the floor and seeing if the heat draws her back in the night.

You could also may a thin layer of flour down, and check for trails. (If you don't have carpet)

Or as Pit said, a live feeder to try and entice her. Oh and luck.

But id start with a tear down of everything. They have been known to turn up on/in/behind stoves, dishwashers, washing machines, ventilation, and piping. So your gonna want to look any possible nook or crannie she could have fit in.

Or as

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