I hate to be in the position of defending Casey, but the news story I read actual said she was told to go back to her cell and she did so without comment. Not quite the same as "calmly" going back to her cell minus being told to do so. I think the point of the story was that she didn't balk at returning to her cell. NG went on and on about her being unemotional as she watched the search. She may well have been but that's not what was reported in the story I read.
Thanks for the clarification, gardenhart.