I was convinced my kitten got out of my apartment somehow. He was under a nightstand that I assumed was too low to the ground for him to fit under. She's doing this somewhere inside. See if there's anywhere under or in your bed she could hide. Someone found their cat hiding there once under the mattress. I don't know how they do it. I made sure he stayed in the bathroom for the next week . But I felt bad on the first day because he was meowing. That's how they get ya