Juliette Season 3 Mystery

Riddle me this:

Why did Juliette tell Sayid, "You would kill me if I told you everything I knew" (or something along those lines) way back when Jack brought Juliette to the Losties camp in Season 3? There is more to Juliette than has been explained (Latin, the role of the "mark" on her back, etc...)

Don't get me wrong, I've seen every episode about three times, but I feel these have not been answered.

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