Drake remained in contact with her, implying that she's been working as an anonymous agent in Batman's plans.
As leader of the League of Assassins she also -- again under Slade's control -- attempted to kill Kara Zor-el and masterminded the escape of David Cain from prison.
Cassandra beat Rose by critically wounding her and giving no choice but to get her medical attention.
She then proceeds to cast another spell on you and has you worship her strap on.
Justice League Elite Cassandra joined the Justice League Elite, masquerading as an assassin named Kasumi to monitor the team for Batman and participated in several missions with them.
Batgirl then pursued of the into an explosive firefight, but lost her.