She has been confirmed as one of the remaining surviving S.T.A.R.S. members, so I don't think she died. As I said in another thread, I personally like to believe that after the mansion incident and maybe the Raccoon City incident, she went off and lived a new life somewhere else. I don't think she had that same passion for taking down Umbrella and all other biohazard organizations as the other S.T.A.R.S. members do. I really highly doubt we'll ever see her again in anything not named The Mercenaries.
I do still wonder why we haven't seen Barry yet, though. Even though he's getting up there in age, I still would've expected some kind of appearance. I always thought he should've taken the place of Josh in RE5 as the outside man who comes to Chris and Sheva's aid.