I love Sarah/Jared fic, so this is a treat! The only thing I can think of with the seven riddles is that they might be related to the seven deadly sins..? One truth would probably be that he loves Sarah? Seven kisses for seven chakras? I have no idea what I'm saying.

Oh, and I second (third?) the Literature suggestion. That could also be a way for her to make the Labyrinth less real, by learning the mechanics of stories. It might also help her solve the riddles.