Brilliant! This explains everything. An extremely talented swimmer, destined for the Olympics, lost everything after she decided to get plastic surgery to change her look. Banned from every possible place to practice, she was forced to give up competitive swimming forever. Devastated, she devoted the rest of her life to exacting terrible vengeance against the person who had ruined her life.

Or not. I actually have no idea if this is it, but it’s still a great explanation.