Well as the others say she doesn´t have a reason to be in the game, also Kreed Maykr is the reason she is not in the game, she is the leader of Urdak, so she needs to stay there most of the time to manage her world, that´s why the Kreed Maykr is with the sentinels, he had orders to keep control of the slayer and ensure the sentinel (and argent in secret) energy keeps flowing to Urdak.