Gabi Garcia if there is no testing might be able to beat a male ufc fighter thats 125 lbs if there is anybody there with a bad ground game.
Ronda would beat Cain under the right circumstances as has already been stated. Other than that not really. I would favor CM Punk against most if not all female UFC fighters. Maybe a couple that has good enough striking to stay away and win on points. But it would need to be somebody like CM Punk or Fred Ettish, somebody that doesn't belong in there and doesn't know what they are up against.
I wouldn't count on Gabi beating anybody to be honest... So uncoordinated. Even if she fought somebody 100 lbs lighter with a by UFC standards bad ground game, how could she take them down? Too slow, too uncoordinated.