I think Rousey used to legitimately be an egotistical asshole, but getting smoked by Holm and Nunes broke her and humbled the hell out of her. I think she's a totally different person now. BUT I think that she's carrying her personality from her run as her character. Ronda, pretend those two losses never happened.
She's a fascinating person. I think she has wanted to wrestle her whole life, but her mom pushed her into competition for her whole life, and she finally got to be who she always wanted to be after she lost.