I don't think she struck at you "because" you were moving her water bowl...only because you were "invading her space" & she felt a little threatened by your
presence there. Some snakes just re-arrange their decor more than others...none of my current snakes do that. Maybe the overall cage is too small for her?
That is one reason snakes may push on things, & since you mentioned getting a new tank, that might be what's going on here?