One keeps a secret for many reasons. For Rachael, it was to avoid shame and because she didn't know how to tell anyone about it.
Having been sexually abused by someone so close whom she loved dearly, the realization of what was happening to her caused her world to crumble. Her spirit and will to live tumbles down with it. Everything about her cries for help, but only from within. It becomes a war she continues to fight every day of her life. It threatens her relationships and even her very life.