His explanation is, if possible, even more remarkable and oddly touching, a kind of reverence for what she is that she's never seen in a human before. He even seems to struggle with expressing himself in words almost as much as she does. This is a new and valued experience in her long life, and she smiles a small but genuine smile at him.

"The Doctor has much the same view on humanity, you know," she replies, not keeping the fondness out of her voice. "And I often fail to understand humans as well. There are some forms of understanding one may be barred from forever, but this does not discredit us. Nor does it make striving for it futile, as I think you know." So, if he'd like to comprehend her a little better, she's willing to help him as much as she can.