If she's in reasonable fear for her life, there's no need. Though the cops will probably do a lot of "testing" with that can before returning it, if they ever do.
It could have been a little bit better. I think I would have prefered the girl to use a pistol. Yes it's a spoof, but at least lets be reasonable with it. Anyone seen the movie Vacancy? It would have lasted less than the length of the trailer if they were CCW'ers http://movies.aol.com//movie/vacancy/26075/video/trailer-no-1/1863100
I know better than that. Chicks with guns wearing Bikini's Shooting Zombies while bringing me Beer and Hot wings.