Isn't our future Magic Overlord adorable?
"Gather my servants heed me ... TELL ME WHO IS YOUR KING!"
You know, normally if a voice in your head is telling you that you're a king it's a bad sign but I think she'll be okay.
If I remember correctly, the word we always translate to "demon king/lord," "maou," can also translate to "magic king" or there abouts. I'd say with her magic talents she's certainly a magic king if not the demon kind.
With the awakening of our true Magic Overlord, only the world itself will satisfy her. She will bring forth rage and destruction to all middle earth and usher in a new age of war and death.
It's only a matter of time before she gets what she desire, we must join her.
For she will have dominion on all life until the end of the world.