I don't think you could do enough to make up for them.
[She knows it's harsh to say so, and so she breathes out, forces herself to feel calmer-- it's not to this strange mouse-knight to undo everything the Lannisters did. And just that he's willing to try, even without knowing any of it... is more than she could ever ask for.]
You're a much better person than any of them. You act more like a true knight than most I've met.