I'm not about to say that a woman of Michelle's size couldn't take a guy of the same size as the guy in the video, but I will say that it would be very hard, and very few and far between if it did happen. I have seen 100 lb girls roll with 170 lb guys and get a legitimate submission on the guy during practice. There are certain types of martial arts that are meant to give a smaller person a better advantage, BJJ happens to be one of them. With that said though, I have seen far more women get manhandled during practice than I have seen women getting legitimate submissions. There is only so much leverage, skill, and style can do to compensate for that big of a size difference, and that goes for guys or girls.
"Experience hath shewn, that even under the best forms of government those entrusted with power have, in time, and by slow operations, perverted it into tyranny." Thomas Jefferson