[She turns away from him for a moment, but he might catch her blinking very quickly beforehand. To be told that you're less than human - to kill just to feel useful - there's nothing she can say to that. Even saying 'I'm sorry' would belittle it.
When she finally turns around, she looks a little stronger, and even smiles slightly.] That's what I'm trying to do, too. I used to do it because people assumed I was bad because of my mom... but now I have done something bad, and I want to make up for it however I can. That's all that matters now.