When David heard that Nabal was dead, he said, Blessed be Yahweh, who has pleaded the cause of my reproach from the hand of Nabal, and has kept back his servant from evil: and the evil-doing of Nabal has Yahweh returned on his own head. David sent and spoke concerning Abigail, to take her to him as wife.
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."