I am a cheat villain

Maxwell at the age of 17 is a famous author. She has written more than 100’s of books, is a champion in various styles of martial arts, a mafia leader, and a business tycoon. She is very out going, yet no one knows who she is. She is that girl who sits in the back of the classroom, always on her phone. One day, on her way home she sees a kid in front of a speeding truck. So what does she do? Of course run to push the kid out of the way. Truck~sama strikes again! When she woke up she was confronted with a fantasy world. To make matters worse, she was the hidden villain, Thana Van Durban, who was very little mentioned in the novel. The side villain that used to harass the original protagonist of the novel she read. She was killed by the heroine’s male leads... very anticlimactic in the story...

To avoid a trip to the guillotine, she decides to get so strong that no one can touch her.