Yep that's called lurking and they'll often do that when they are ready for a meal. Sometimes though they will also just watch the world go by that way so don't let her fool you into overfeeding LOL. Sounds like a great feeding response and a lovely healthy, happy BP. Maybe the snake can watch your wife eat a burger and go "ewwww cooked meat? condiment? lettuce and tomato? how GROSS! have a nice warm raw rodent instead!"