Excellent links!
In the first match, Michelle certainly seemed to give it her all, but she was just outmatched. And I agree, I think she left the ring in frustration. Perhaps she thought it was going to be an easier match, or she thought it was going to be a playful roll around, not a real match. The fact you have never seen her in another match seems to support that idea.
The second match was awesome. So much breast to breast action! Both women went into the fight determined to win, and it showed.
I totally agree about how rounds could be decided, either by pin or submission. There are some matches where a pin might not be feasible because of body position, but a woman might want to submit. It makes perfect sense.
Personally, I would love to see more fights where rounds are decided solely by full body, breast to breast pins. But that's just my personal view.