Nobody knows where she came from, only that her power has grown so rapidly that what was a suspicious incident to some local sheriff's department a few days ago is now looking like the inevitable takeover of the entire world.
You've gone to the source to stop the evil at its source, but you didn't know what you were dealing with. How could you, when you have had so little warning?
The moment you step into her fortress, you are lost. Her power permeates every speck of light, every tiny sound, every molecule of the air you breathe.
You may think you go to her throne room to hunt her, but she is calling you to her. In the bastion of her power, you are lost. Her absolute power calls to your soul, and you give it to her willingly.
There is no 'you' anymore. Just another foot soldier in her army of world domination. The joy and satisfaction you feel is merely her toying with your soul.
The human race is already hers. Like you and those before, they just don't know it yet.