I have to agree with flindip though that giving someone a belt without a single fight for the organization is kind of insulting. A title shot would be fine, but since the UFC doesn't have any actual woman's division yet that isn't possible.
I mean it should be the first fight is a title fight period. No reigning champ. Both fighters have a chance for the belt. I realize its impossible and unfair for Rousey to do a "fight up." But, I think its still reasonable not to just hand a belt before she hasn't even fought a single fight in that org.