Honestly, Sarah? I don't know, but I don't think it's that straightforward. If it were, I'd have told you. I like having you here, but I know you've got to get back.

[Assuming they can. The fact that her memories line up with Sarah's but Sarah doesn't remember Cosima disappearing leaves a couple of possibilities. One is that she goes back to the exact point she left; wakes up with no memories of Thedas. The other... has some data supporting it, but is a more complicated prospect, and Cosima doesn't want to go speculating without being sure. At least surer.]

...also I don't think you told me how you wound up in a Mexican prison.