Wht doesn't Rousseau recognize Jin?

I'm brand new to Lostpedia and this may have already been answered by one of you or the show. I was bored yesterday and was working on a timeline. I think I have a pretty good grasp on what happened and can explain it to someone who doesn't get it. The only thing I can't fully grasp is why Rousseau doesn't recognize Jin after the crash. Jin recognizes her when he is flashing through time because that is is real timeline, hence he already met her. So it would make sense that Rousseau would know who he was after they meet in 2004. Am I missing something or what? Please help.

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