We keep thinking that she wouldn't wander this house much... we have so many dogs and cats. At night, they sleep soundly but I would think she'd eventually have caught someone's attention and they would have reacted to her. (Or still might, of course.)

This is an old house with so many options to escape... we keep coming up with new places to look, but have concentrated most heavily in the room with the tank. I just put some used mouse shavings in a box on the floor... maybe she'll come to the smell and stay in the box. This is the worst feeling. :-( :-(