Why??? Cyborg herself has done that to so so many women and they did not quit, why should she? I dont think she is soft like Rousey. She will be back. (Most likely not in the UFC though, they are trying to get rid of her division anyway).
What else is left to do other than challenge Nunes again and after tonight I don't like her chances in a rematch and no other woman will give her any competition in a fight. Maybe I'm just prisoner of the moment