"That's what you are now, though. Or were you, like, some disembodied theory of justice before, and now you're a person made out of justice, or am I totally off base here?" She's finding that it's really important to know this, as if it might help her understand where they're coming from and what she, and the others, are supposed to do.

Plus she's a nosy kid with a stubborn streak, and not getting this is bugging her.