That's why! I don't want any of our snakes see our hands and thinking food. And apparently she knows that the tub is for feeding.
Thanks all!
As long as you continue to be in the tank on a schedule to change water, spot feed, and handle them they learn to not associate your hands with food. My big ol' female will never strike at me when I do any of that, but when I dangle a rat in she makes quick work of it.