It mattered little to her whether her son was captain of the team or not. As long as he was happy and enjoying himself, that was what truly mattered. If he did not want to do it, he didn't have to. After everything he'd been through recently, Narcissa was just glad he was able to enjoy the game at all.
At the mention of Miss Greengrass, she perked a little, her eyes shifting from her husband to her son. She was still a bit hesitant when it came to Draco being involved romantically with anyone, but that was only because she was so protective.