Hogwarts: Who made her a professor?

What should I do if I travel to the world of Harry Potter?
Belvina Black gave her answer: Just stay put and don't give up, just lie flat.
However, an unexpected event occurred, and she was forced to return to the turbulent Hogwarts to become a professor.
In order to continue to survive and coast along while accumulating points, she decided to take some initiative.
Damn it!
I accidentally overdid it!
Things have gotten even worse!
This book is also known as "I'm a Spy Who Can Use Magic" and "The Villainous Young Lady Can't Save the World," among other titles.
Notice: This book features a female protagonist who is single. If you don't like this kind of story, please do not read it.