She's messing with the original tablets. She's making fakes and spreading it around at the same time the real ones are being found. So people are getting confused. Spoiler:
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From what I read from a spoiler I saw is that the other tablets she releases have holy power in them and resemble the originals so the suspicion of forgery is prevalent but quite hard to find the culprit as it takes a great deal of holy power to make just 1. There isn't supposed to be an individual alive who has that much holy power after all. She made 10.
(≧▽≦)
Our Mc....go big or go home.
Minor Spoiler:
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If I remember correctly, the tablets show quite the negative side to the Duke's family. It could put them in a very bad light. Also, I think there might actually be more than 10 that the MC makes but I'm not sure now. All I know is that making one can kill you since it does take quite a lot from the maker.
I think MC is aware of that fact because she's read the work but I don't think she cares or truly comprehends what it means. Like how she's experimenting with her powers with flowers, I think she's doing the same with her holy powers as well. Testing here and there and causing quite the stir which puts focus away from the Duke.

I don't get it did she take the stones or not