The website listed above is pretty complex and breaks down the body language techniques into anatomical regions, ie; arms, legs, hands, face, etc...You may have to do some reading to find one that corresponds with our "subject".
There is much more that others will pick up on, but the first thing that struck me, in regards to Casey's body positioning, in the hearing was this. It was taken from the above website.
BBM.
Attack signals
"When somebody is about to attack, they give visual signal such as
clenching of fists ready to strike and lowering and spreading of the body for stability.
They are also likely to give anger signs such as redness of the face."
http://changingminds.org/techniques/body/aggressive_body.htm
Obviously the clenching of the fists, exhibited by Casey, grabbed my attention.
I am sure there are others that I missed, like the holding of one arm with her fist. I am certain this must mean something, but I had a hard time finding it. Maybe some WS'ers will figure it out along the way.