Honestly? Rey half didn't expect Qui-Gon to actually go for it. Or at least not to answer so plainly. He didn't even hesitate, which seems odd. And yet, more odd than that, Rey finds that she does believe him.

Maybe it shouldn't seem strange. Qui-Gon does appear to be, after all, the result of stuffing a giant pile of secrets into a robe. What's one to add to the pile? If Rey has trouble getting straight answers from him, she can't imagine others have much more luck. Her secret is safe, if only by the Jedi's overall enigmatic nature.

She eyes him skeptically, taking a bit longer to respond than she actually needs to deliberate. She doesn't want him thinking she'll just jump into believing him about everything every time, after all. That would almost certainly backfire at some point. Plus, there's still a chance there's a catch to this deal somewhere, considering how unequal the terms are currently, and she's not about to let Qui-Gon sneak anything past her.

"Just one rock. That's all I have to move."

She speaks slowly and carefully, as if haggling a price with a particularly shady business partner. The metaphor isn't... entirely inaccurate.