Boxing. A good punch/combination is quick, so has the element of surprise allowing for escape, she will develop extreme fitness and thus the ability to run if required, and the shiny shorts are cool.
Traditional martial arts take such a long time to become adept within and developing the strength to grapple with a man will take a long time.
Traditional martial arts take such a long time to become adept within and developing the strength to grapple with a man will take a long time.