So I have a guess were she is. The next room over is a bathroom with a shower. The hot water pipes might provide enough warmth to keep her from wanting to move despite putting out food, gerbil bedding, etc. Do you think it would be a good idea to play load music or something in the bathroom to try and drive her towards the hole in the wall were I've made a hide and everything?

The apartment next door has the AC on so it actually pretty cold in the wall. I'm worried she won't want to move from one warm spot if everywhere else is cold. I have 4 nights left to find her...