For Milicent, turning her back from her dream isn't an easy job.
She had left behind everything as she leaves the military: her life, her dreams, her joy and her only hope on actually "living". Even those emotions and memories she knew she had forgotten long ago... she knew she'd be leaving them behind. But then, another thing she thought she left behind had actually remained with her all the time. And it was a "split personality" that is inside her.
Of course, she has nothing to do with her. She actually treats her more like a burden than what this personality claim as a "sister". As she tries desperately to get rid of her, she opens up a past she had hidden long ago, and to remember all the bitter memories she tries to forget.