She dated the female protagonist's crush, Matthew Collins, while in high school, much to the protagonist's disappointment. She is the Water Guardian (Trent Baker is the Water Guardian if the protagonist is male).
During the events of the game, the protagonist is able to change history so that Ashley dumped Matthew and he instead formed a relationship with the protagonist.
This is Ashley's biography during the process of the story change.
Ashley was in a difficult relationship with Matthew, and she was madly in love with him.
In the Blood path, Ashley ends up in the Emergency Room. Matthew sees her at the hospital, but she has no idea who he is.
In the Light path, Ashley leaves Matthew and dates another guy, Jason.