Eight Extremes Fist—it was a martial art Dorothy had learned during her "chūnibyō" phase in her previous life. Since she couldn't find a dojo nearby, she simply watched videos online from a master surnamed Li and practiced by herself.
As for whether she mastered it or not, Dorothy didn't know herself since she barely left home being a shut-in. Naturally, she never had the chance to fight anyone and couldn't verify the rumors that people had died from it.
Of course, Dorothy wasn't too keen on whether the martial art could be applied in real combat; after all, she learned it just to look cool and, incidentally, to get some exercise.
Thinking back, her skill in this martial art was far from perfect; after all, in her final moments, crushed by a dump truck, her peak effort punch only managed to pierce the truck's front before she was run over, turning into a splattered mess of encoded tomato sauce.