Catnapper--here are some searching tips from catsinthebag.org for finding a cat that may be still in the house:

If your pet may still be inside the house, be sure to check the following:
• In reclining chairs — inside the ledge that supports the footrest when it is extended
• In box spring or mattress — with a flashlight look for torn lining in box spring or mattress
• Under platform beds
• Behind the books in a bookcase
• Behind unopened drawers in a dresser
• In the chimney
• In heating ducts
• Behind access panels
• Behind the refrigerator or stove
• Wrapped in the bottom of your drapes

Sending prayers from Chicago that she's safe and comes out soon.

AbbyMom