The poor girl just acted on instinct. The parents should have let her know they kept a snake, and more importantly, should have been more responsible in caring for it, to ensure that it wouldn't escape. Just because she lives in Texas, doesn't mean she's guaranteed to know which snakes are harmful, and which aren't. The majority of the population is quite uninformed. With that said, she must have some powerful instincts, in order to cut off the snake's head. I don't even have the guts to kill a spider, so I'd likely throw a bowl on top of it, and call someone. Anywho...as far as I'm concerned, if we are pointing fingers, it should be at the parents.
"Trace the moment...Fall forever"