Well now she's deep in thought. Why? Because she has no reason to disbelieve Cullen. She knows he's telling her the truth, from his perspective. So there's a disparity, one she needs to account for.

There's only one way she knows to do that.

"So, they're using time magic, too," she murmurs. "That is the last thing I remember before arriving here, three months ago. So they've somehow managed to bring us both from the same point in time back home, but I arrived here three months earlier than you."