Why Is the Female Devil Different in the Book?

Yu Ping traveled to a novel about cultivating immortals and was caught in a devil's cave. The owner of the devil's cave is the biggest Mahayana villain in the book, the female devil. According to the description in the book, she is ferocious and has a perverse personality. However, the timeline he traveled to seemed a bit too early, a thousand years before the story began. The so-called Devil's Cave is just a copycat, and the female devil has just gained the golden elixir. The female devil at this time seems a little different from the description in the book.