Originally thought to have killed Stephanie by purposeful lack of medical attention, Dr. Thompkins actually faked Stephanie's death and set her up with a new identity in Africa to protect her. Stephanie, however, eventually insisted on going back to Gotham. This was revealed in Robin #174. Leslie is currently back in Gotham and running her own clinic, with paralyzed former Teen Titan Wendy Harris in her care. This all happened in Batgirl (third series) (8).