She does not have to. This woman has nothing to prove, and there is a distinct issue with fighting men because of the chivalry that we want to keep up in society. She is not going to fight a man because it is not fair to either parties. If she beats a guy in a match, he will be crushed forever for losing to her. If she loses, everyone will say that she was a fake even though she is the most dominant female fighter of all time.
There is something that we need to remember about the way that fighting happens in MMA as seen on noticias.uol.com. They fight in their weight classes, and the playing field is level. This is not some kind of cage match society that is like the Thunderdome. If you want to live in the Thunderdome, that is fine. However, none of the rest of use live in that world. You need to remember that she has nothing to prove, but she is not going to put someone in a bad position.