I'm sorry to hear about your snakeI know I'd be freaking out too.
My bp's tub is in my room right next to my desk, and she never seems to have a problem coming out with my desk lamp blazing. I think it all depends on where she got it in her mind to go and how easy it is to get there. If it is significantly cooler then I doubt the hallway would be her first choice, but you never know. Is there a way she could have gotten under the door?