Board Thread:Manga/@comment-24930713-20160109100623/@comment-24930713-20160206010758

RaggaR wrote: Didn't read other comments so I don't know if it's pointed out yet, but back when we saw Marcel die - don't remember exactly when that was - Annie wasn't in sight. It's possible she wasn't travelling with them back then, which supports the claim that Annie is from inside the walls.

I agree that she likely wasn't traveling with them originally, but was instead a sort of back-up member when Marcel was eaten. Reiner and Bertolt certainly never mention it. Though, I get the feeling her father might actually be the one from inside the Walls, and the way he raised her may be why she's not as ruthless as the other two.

It's such a long wait to find out anything. :(

Also, please don't discuss spoilers on the wiki. It would be best to discuss them off site. I know no one has mentioned any yet on any of the threads I've seen, but I'm just making it clear beforehand.