So the past self offers no insight into who she ll be in the future. In a traditional story or a movie, a character reflects on the past perhaps through a flashback sequence. The character is struck by some reason why she is how she is. She has a moment of understanding. Then she makes a decision based on past lessons.
Future actions follow.
The moral is that our lives are unraveling mysteries punctuated by moments of understanding. At any moment, another moment of understanding could come. We are pending revelations. But Williams character is not who she was last year. She doesn t have access to that moment with its motivations and passions.