She sure married a POS. What Effing prosecutor makes a case of this? Oh wait...it’s Florida.
When she fired the shot, his hands were supposedly up and the gun was supposedly pointed right at him. Use of deadly force - which is what a warning shot is - requires reasonable fear of imminent great bodily harm or death, which someone with their hands up does not present.
She didn't "stand her ground," she either assaulted him or attempted to murder him.