Search close to the tank. They don't tend to go far. If you don't find her near the tank work your way out from there. If a place seems to small for her to hide, check it twice. They get into tiny places.

Secure the room if you can to limit the escape area. Search at night when it's dark. They don't venture out often during the day.

Don't panic if you don't find her right away. It can take days/weeks to find them. You can try leaving a heat mat on the floor near a way with a hide on it. She might be drawn to the heat.

Good luck finding her!