She's down there somewhere. Probably hiding. She'll come out. She'll either be thirsty, hungry or need a litter pan. And if she urinates outside the pan, the smell will show you where she's hiding. She'll come out. Cassie Cat hid under the sofa for almost 3 days when I first brought her home, but I know she was using the litter pan when I wasn't around. She's still inside the house and that's the important thing.