Try a bowl of food, water and a litter box as close as possible. Turn out the lights and keep it quiet. She may come out during the dark - cats are nocturnal. If she's not out in a couple of days (and she got inside the couch) you'll have to turn the couch over, get her out and then patch the entry hole. Good luck and be gentle, quiet with her. No loud music. No toddlers or other animals in the room.
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