I know what you mean--sometimes, no matter how careful you are they end up finding a way to get out anyway and you really get angry at yourself for it--why didn't I double check, why didn't I discover it sooner, etc. (I have a rack, and sometimes even if I think I pushed a tub in it wasn't completely in.)
I would say the chance of her going out through the screen into the cold like that is very low, but I'd cover the screen hole and do exactly what JLC said. Might be messy, and takes a few nights, but it is the best way you'll find them. That's how I found mine after my dad left the tubs slightly open 3 weeks after she escaped. I'm still waiting for my other one.
It's really frustrating, but keep your chin up--if you truly love something, sooner or later it'll come back to you, it might come disguised as luck, fate, fortune, it might come quickly or slowly or almost not at all, but it will come, and it'll love you back.
(but I'm obnoxiously optimistic when it comes to escapees.)
Lots of luck.![]()