And, possibly, in close proximity to a good guy. Either a very well-aimed shot or a very lucky shot. Lucky for the CO that she didn't shoot him instead of the bad guy. Imagine how the anti-gun folks would have spun this if her bullet had found the wrong target.
Things go wrong sometimes. Things went right for the citizen and the officer. Not so right for the aggressor.
The leftist gun control zealots will complain either way. They think it's immoral to defend yourself or others with deadly force. It doesn't matter who is the aggressor. It's just a completely different mindset. But if she had shot the wrong person, they'd sure use that to disparage self-defense.