As has been suggested, Jules could well get off the island but because she wasn't one of the 815 passengers perhaps we just haven't been informed yet. Also, even if she doesn't make it off the island there's good reason to suspect that at least a few people are still living on the island at the time of Hugo's Abbadon visit - "are they still alive, Mr Reyes?"
Hugo therefore knows the score, or at least Abbadon has reason to believe that he does - what I don't get is why he's so relaxed and care free (to the point of being sneaky -
"goooood") in this episode (Ji Yeon), which is the closest forward flash to when the Oceanic 6 get off the island (2004/05). I guess it's the same with
Jack..in most of the forward flashes' he's fine and dandy (at least on the outside, he may be masking it..infact I think he is), but the gradual decent into 'going back' washes over him within a few years (2007 - suicide attempt).
So i guess something (or a series of somethings) happens to send Hugo back to the mental facility..as it does with Jack wanting to die/get back.
Interestingly Kate maintains a steady approach.
So basically I don't think Jules is dead - least I don't think her story is by any means resolved..we still need to find out where she learned taekwondo from
