It's not really worth it to start the boxing vs. mma argument again. In a fight where both fighters are allowed to use ALL of their tools, MMA seems to usually win out (talking fighters of similar sizes and skill levels at least). Of course if you say to one side that they can only use two of their tools and have to leave the rest by the wayside, that side is gonna lose usually.
This one comes down to gender as much as skills though. As good as Ronda is, you can't just sweep the man vs woman thing under the rug.
It's not the same I know, but remember old out of shape Joey Buttafucco easily beating Chyna down in the celeb boxing match. No MMA involved, but she was a big, athletic chick (and fake or not, pro wrestlers are pretty damn strong).
I give her a shot, but I don't think I could go more than 40/50. I need to see a woman take some shots to the head from a dude and keep coming before I give her the advantage. As someone mentioned earlier though, a lot of this depends on Floyd and whether or not he would take it seriously. If he didn't, that would be real stupid, because he seriously needs to keep her from getting one of his joints moving the wrong way. If she could manage to get him in one of those positions....