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She did say that other than her EVERYTHING ELSE about the flow of the story is still exactly the same. Also, everytime she makes contact with Mia, Mia keeps throwing her these evil, hateful looks. All these things considered its pretty reasonable for her to worry that Mia is going to turn into the villain of the "story". Especially since that's what USUALLY tends to happen in a lot of these villainess stories.
And also, it still might. Mia says she's going to back down, but who knows if she actually will once it gets out that she's the Saint and the church forces the emperor to marry her.
Omg stupid why are you gonna believe in the original story line when you changed it already! Dude omg! I have no words to explain how I feel!