Thank you for all of your help and concern guys!
We did find Maddie, finally... she ended up having a 3 day adventure.. and we found her in the downstairs laundry room hiding under a rack of hung clothes.
We tried the food piles in each room... and the dust bath... that helped narrow down which room she was in for the first day.. but then we coudlnt' find her.
Then we tried checking out the downstairs, cause I do remember them liking to run up and down the stairs... luckily, my mom found droppings in the laundry room, and sure enough, she was hiding in there.
Poor thing was without food for a few days... i hope she didn't ingest something she shouldn't have.