[Alright Draco you are managing to get a bit of a smile out of her with your apology. She's been waiting for this for a while. She nods]

Well, that's what people have been trying to tell you for a while now...but I understand that your family influenced your opinion a lot.

[And then she looks down at her wrist the word 'Mudblood' still faintly visible]

I'm not sure that you could have done much to stop her. She was going to do what she did anyway. So you don't need to apologize for that...