A decent size of her story is probably going to be about the hospital.
A lot of answers are inside those walls. That's my biggest guess. And I'm sure she'll be in different areas covering other questions that are floating around about the game. I'm thinking that her DLC will be about 8 hours. That's enough coverage, unless they decide to leave you once again out in the dark with more unanswered questions.
DLC will start to take over our minds at that point.