She says she's a Cryst-Fairy and the scriptures tell Crystalists to follow the guidance of Cryst-Fairies. Like I said, she's a false prophet. She has nothing to do with the Orthodoxy, she just makes the religion look evil, which it isn't.

For the corrupt church, just do the vampire castle quest. I know a lot of things you already have spoiled for yourself, but the story there is really interesting, so I'll just leave it unspoiled for you.