As a person who possessed the 'body' of the 'vicious cannon fodder' in the original novel (heaven's perspective) who should've died since the first ten chapters, she was alive, and not only that, her strength progressed faster than that of the daughter of destiny, the heroine in this world.
No wonder heaven punished her for breaking the rule. To put it simply, even if this world was more than a world inside the book of heaven, her existence here was like a bug that disturbed the process of heaven.
She finally understood that, no matter how much her arrival changed the original plot, in heaven, an existence like her must cease to exist, and this wasn't the place for her.
The red thunder lightning was originally for punishing the evil beings who broke the rules of the universe, using the taboo method to practice, walking the bloodpath, and many other evil sins that hell won't tolerate.
