Evangeline Lilly gave an interview to Entertainment Weekly. Now that her hopefully one Kate centric show of the season is over, I think she would like some more attention focused on her so she gave her theory of Kate and how she sees her character on the show.
"My personal theory on it - Damon and Carlton haven't approved this theory, it's just mine - is that Kate has in her sole memory, actually gone through the three years that we've watched her do on the island and even her flash-forward stories. That all of that is in there somewhere - she just doesn't have a conscious memory of it. So what I'm doing is playing a woman who is constantly sort of in battle with herself. She added: "There are things within her that she knows and understands but she doesn't consciously recognize."
Huh? I am not sure where she is going with all of that. Her explanation is even more confusing than the show. My feeling is that you should just watch each episode and that at the end have enough trust that everything will become clear and we will get all the answers we have wanted.