The Exile was sort of turned into a weaker character than we experienced in KotOR2 and it is a shame. This distracts Revan (whom may have won IF Scourge joined the fight at the start) and the Emperor is able to subdue and capture Revan (yet again). Since it wasn't Revan and Meetra, Scourge (after the Emperor explodes T3 with the Force) stabs the Exile in the back killing her. Lord Scourge, who has had Light Side visions (he was sort of starting to redeem and Revan was teaching him) saw a vision of him and another Jedi (the Jedi Knight player's character) defeating the Emperor. They infiltrate to the Emperor's throne room and the fight isn't going too well. They hook up with Lord Scourge (who becomes the Jedi Knight's companion in SWTOR). After Revan disappeared (also detailed in the book) she and T3 find him again on Dromund Kaas. The canon Exile is a female Light Side Jedi named Meetra Surik. Her death is depicted in the single novel, Revan.
(Not putting spoiler tags because if you come into a thread called 'what happened to the exile' and don't expect year old spoilers.
