It was wrapped around her neck? Um, why is she alive?
Good question. Quick response by the EMT/fire department I guess? Sounds as if it was attempting to eat her.
It was only 5 feet long... not even big enough to knock her down or anywhere near heavy enough to keep her from getting up - she could have gotten up after being startled and staggered into the kitchen for a knife. [She was probably carrying the tank in with the lid half off and her nose sticking over the top as she walked ... but the snake was probably getting ready to shed and half blind and grumpy or hungry...when it went for the opening , detected the carbon dioxide from her exhaling, and clamped onto her mousy little nose.]