It wasn't that Natalie didn't love her little brother, she did, she really did, but he was just so loud and demanding, not to mention a real pest, and she really hadn't been able to take it anymore.
She hadn't meant to hurt him. She'd just wanted to make a point, and maybe scare him a little. But that was all. Certainly not this. She hadn't meant for all of this to happen, at all.