poor frightened kitty. We have a "found" calico that is what I call a "tree cat" as opposed to a "bush cat"....she managed to find the one spot in the finished basement that had an opening into the drop ceiling just large enough for her to squeeze thru and there she was for several hours before we could coax her out.....so yes, besides lurking in dark corners (which she also did) look up......leaving out smelly wet food is a good idea, she will eventually come out and join your mom..........just have mom go down there daily and "talk" to the basement........also have her (mom) talk out loud occasionally upstairs in the living areas, kitty will hear the familiar voice and venture out..........