While I don't know that I would go so far as to say that she was the main character, I would say that she was A main character along with others. She was key to the whole story. She was the catalyst that started the ball rolling. In fact, at the the rebels hideout, until she decides to join, the story won't progress. Without many of the events and choices that she make there would be no story. I know that she was not even available for the first part of the WoR but it that was part of the the whole story, the feelings that she had to work through as she struggled to find her place in the world.

In the end though, I would say that she was part of an ensemble cast. There was no single main character in the game. But that's just my opinion.