So you don't know how, but you're certain they can.

[Spock's certainty is good enough for her. She assumes that the rewards can alter small things, along long stretches of time, and she thinks automatically of Gaila.

Asking for a planet doesn't even occur to her, because she's sure that, were it possible, Spock would have asked for Vulcan.]

The Spock on this ship. Is he another version of you? Will you be returned to the point in time when you struck your bargain?