Missing scales?

[Bogertophis]

Oh my goodness I never even thought of that! Thats horrifying to think she could have done that. Poor thing. Ill do that right away!

And maybe she was right under the heat at the top, so double check those temps. I've personally seen snakes climb straight up glass tanks by pushing up off their tails as far as they can until they reach the top ledge with their chin, then pull them selves up ("chin-ups"!). Never underestimate a snake that's motivated to escape & go exploring.

BTW, don't feel bad that you didn't know & haven't seen this...snakes tend to do this "gymnastic" stuff at night, or when no one's around to watch.