I'm really sorry to hear that. I had something similiar happen with my first BP, Kain. His cage was next to the door that led out to the shed in our old house, and one day I forgot to latch his cage back, and by a stroke of extra bad luck, the door was also cracked open. So out he went. You might try doing what I did, if you're friendly with your neighbors at all - I took a picture of him and knocked on a couple of doors, told them what had happened, and that if they saw him, to come and knock on my door. I didn't want someone taking after him with a shovel or anything out of ignorance. But I lived in a very friendly neighborhood, my neighbors knew I had snakes and were ok with it. Yours might be different. Is there any way she could have gotten underneath your house? Have you checked all the water heater pipes, behind the washing machine-anywhere warm in the garage. Odds are she took to the first dark, warm place she found. Good luck!