So many choices!! I LOVE the idea of the last option, I could see her having a full on meltdown in the middle of school when it finally clicks.
Also, I really like the idea of him knowing who she is but her not being able to place where she knows him from. Kind of like The Manchurian Candidate, he'll end up saying something that sets Laura off and people will get hurt. People always get hurt when it comes to Laura =P