Or, and let's be a bit more realistic about her skills as a writer, she picked symbols that looked cool while browsing things at a library with the usual entry grade books about magic.
Like, she's a mid tier writer that had next to zero world building. She would have have had to be intentionally bad at writing if she had a background in occult related studies or practices. And, considering how absolutely brain dead she often is, she's the world's best actor if she's really so devoted to whatever practice it is to seem that bone headed.