For in very deed, as Yahweh, the God of Israel, lives, who has withheld me from hurting you, except you had hurried and come to meet me, surely there wouldn't have been left to Nabal by the morning light so much as one man-child.
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."