The story followed a female character who was incredibly talented, both physically and mentally, being smart, strong, and tall. At the beginning of the story, she began to learn a martial art, which I think was either judo or MMA. I remember a scene where she was dominating an opponent with either a hold or a throw. She came from a less than ideal family environment and had a serious complex about her own superiority; she hated people that couldn't beat her.
Further, she was often cruel and violent, sometimes being entirely unable to control herself. This was to such an extent that eventually her master in the martial art the main character was learning wanted to sabotage her out of fear of what she might do.
If anyone can point the way I would be very, very grateful.
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