"Defeated you?" Narcissa questioned. "Draco, if you put it like that it won't help you at all. You carry the wand that defeated the Dark Lord. Its magic is your magic. Use that. Use the fact that Potter couldn't have defeated the Dark Lord without you." Without her, too, but that wasn't the issue at hand. No one would believe Narcissa changing her colours, no one would believe that after the death of her husband at the Ministry's hands she'd gladly embrace their propoganda.
No, it was Draco would could lift the family up again, and Narcissa was convinced he could do it. He wasn't his father, but a different sort of man was needed in this different sort of world. Draco was going to earn influence and power, just as Lucius had.
Still, she was disappointed that it had taken so long for her and Draco to have this conversation. She put a hand on his shoulder briefly, squeezing it gently, and told him, "I do miss him, Draco, every day."