I honestly think Pena's bum-rush style of stand-up catches the girls she's faced by surprise. The chick's got athleticism, heart and a good gas tank.. and once she picks up more technique, she's gonna be a real handful for anyone. But right now, her game is: charge-in swinging - wrestle-f*ck - look for late finish. I seriously doubt this 'charging style' is gonna work with a striker of Rakoczy's calibre, or Pennington for that matter. Also think that Moras under-performed and let Pena dictate where the fight went. I guess sometimes, desire and ferocity trumps skill - but you know, props to her for making it work.
Her ferocity catches them by surprise. Also the fact that she's not afraid to get hit, and when she does get hit she keeps coming on. They are not used to opponents like that. And she does have good technique. She throws long punches. Uses her reach pretty well. A nice long, straight jab. She looks pretty wild, but that can happen when you throw punches with bad intentions like she does. Watch Tyson when he's unloading on a guy, it can look pretty wild too. I don't know where you got the idea that Moras is a better or more technical striker from.
I think her style would work well against both Penington and Rackoczy. Watch Penington's fight against Leslie Smith. Penington tends to counter-punch with single shots. Against Smith she faced a fighter who could take her punches and keep firing, and got overwhelmed. Pena looks like she could do that too.
Pena's aggression will be just what she needs against Rackoczy. Not allow her any time to move away and turn it into a boxing match. She'll be in her face from the first bell, and from the clinch she should get the takedown easy. If she could takedown moras who was supposed to be the best wrestler in the house besides Bayzsler, then I don't see Rackoczy a novice at the grappling game doing much about it.