She can't see the pacifying gesture or the thing poking through her food (and maybe the latter is just as well, because what), and she can't rely her on her usual means for judging truth, but if this girl is Fire Nation, she's not really following the same M.O. There's no reason not to believe her.

So Toph frowns, hands tightening on the sides of the boat. "What's around us? And how big is this thing?"

"This thing" meaning the boat. And if there's any land around here, she'd really like to know.