The cops didn't have to charge her, but the prosecutor did:
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Fair enough.
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Her problem is that he wasn't an airplane or a car.
She formed the intent to shoot a person, albeit without malice, and that's exactly what she did. It's stupidity, but it's criminal stupidity because she shot him knowing that there was a very good chance that he could be killed.
Shooting at person and killing him, when you know (or should know) that there's a very good chance he could be killed, is manslaughter because it's the negligent killing of a human being.