Lost a feral in mu house, please help

Hi guys, posted yesterday about the littermates I managed to get home that have been living in a colony by the bus stop.

Ive had the female now three days, the male two, and when I woke up this morning the female had escaped the room she was in. I have a large gate door separating this room from my kitchen (the only entry and exit is this gate) and she has escaped the room through the bars.

She has shown me on the first day she has no fear, and will put herself places she absolutely does not fit. First night she climbed in between the mattress and wall and got stuck. I am terrified of her being stuck somewhere and not being able to find her in time.

The brother cannot fit through the bars and is currently safe in that room, the female though fits places you wouldn't even think her head would fit.

How do I get a terrified feral to come out OR how do I find her???