Trust me when I say this as I am in Law Enforcement: That excuse does NOT work. The only time that will work is if it can be proven that there was absolutely NO way out of the home. And that is only 6 percent of the time. And that is after they thoroughly examine the premises. The intruder ALMOST has more rights then the homeowner.
She WILL empty the clip and drag their butts inside, then wait 'til their cold before calling the police.)
Yeah, the test for justification is essentially very simple: the threat of "immediate bodily harm". If you can possibly run away, or if there was another way out, but you shoot, you go to jail.