She literally says
And throughout the fight you have to deal with her draining the ancient wards on N'Zoth's prison and trying to get the HoA, tell me how this isn't us trying to stop her from freeing N'Zoth that ends in a big fuck you it's happening anyway.Azshara: You see the truth now, don't you, heroes? Every move you've made has been according to my will.
Azshara: That lumbering dwarf believed you could save Azeroth by empowering your shiny little Heart. The gift of a sleeping titan.
Azshara: Yes, a titan's heart was exactly what was needed. Not to heal the world... but to shatter the prison of a god.
Azshara: Such irony...the diamond king has been made a pawn.
Azshara: The ritual nears completion. The Black Empire rises... and the world awaits its true queen.