Please forgive the trespass of your handmaid: for Yahweh will certainly make my lord a sure house, because my lord fights the battles of Yahweh; and evil shall not be found in you all your days.
So Abigail is there pleading with David. Beautiful woman, has brought all of these things, and she is making good sense. "You know why should you avenge yourself. God will avenge you David. He's taken care of you, and so forgive the foolishness of this foolish man."