Maybe she shot him from a weird angle like the side or the back. Lying too much quickly gets people in trouble.
Women get a lot more lenience on this because everyone who isn't a feminist acknowledges that men are a lot stronger than women, on average. As such, risking a confrontation with the burglar would be unreasonable.
Instead of thinking about it like a woman vs a man, think about it like a man versus a man carrying a baseball bat. That's how extreme the disparity is. Would it be reasonable to shoot a man carrying a baseball bat even if he didn't lunge at you?