I'm inclined to think CA was shaking from Anger based upon her historic reaction when she disagrees (being depicted as media hound) with what is being said.......especially if she's prohibited from speaking out.
I watched that portion again, a few times, and here is what I think. Watching this live, I did see her shaking her head affirmatively while HHJP was addressing that this case has had more media coverage than any he has seen in his 31 years experience. And he is now attempting to find a jury outside Orlando who has not seen all the documents and information re this case that are online. It did not occur to me that she was 'shaking' or 'trembling' until others commented on it. I thought she was simply agreeing with HHJP. Now I am rethinking this as Amil observed CA glaring at HHJP during this time. So was she actually shaking her head in agreement, or was something else going on?
ETA: http://www.wftv.com/video/27745104/index.html approx 23 minutes