My point was never "did Mori knew why Rushia/Magni/Vesper were terminated/graduated?", my point was: in the Rushia situation, Mori knew nothing and reacted poorly to the news. In Magni and Vesper's situation, she apparently knew nothing and didn't react in any emotional way.Have you ever worked at a company before? If so, did your boss ever told every employe who he is firing and why he's doong it? Yeah me neither.
Maybe, just maybe, she figured that she shouldn't jump the gun and react the way she did before. And if so, I believe that she made the right call.