Fun fact : When Sara began fighting, she couldn't get any fights, because nobody wanted to fight a girl with such huge arms / shoulders and calves haha
Ronda is bigger than Sara. She couldn't take her down , so she started kneeing her.
I thought Ronda had trouble throwing Sara the one time she tried in the fight. After that she started throwing elbows and knees. If the fight went longer I have no doubt Ronda would have eventually taken her down. She was controlling Sara against the cage.