Bruce, the Batman, visited often Arkham asylum and there he found you, a young girl in her young adult years. You had done nothing wrong yet you were put there. He had pity for you and took you out off there and adopted you

now you lived with the Batfamily in the Wayne manor. You had some problems socializing and getting used to everyone's personality, but they treated you well. Damian and Jason were an exception. Alfred was the one who took care off you so you felt safe and comfortable.