Zuko pauses, thinking for a moment. It's not that he doesn't want her to help - he does - he just doesn't want to dump her into the fire so quickly, so to speak.

The knock comes again, and he holds out his hand to Katara. "I don't see why not. It's mostly paperwork, this evening." Or, it would be now. He's not going to subject her to his damned advisors, just yet. She'll get enough of that later.