Oh yeah, she definitely deserved that. We should just deck anyone that gets upset.
Being viewed as a liability by all of their superiors and knowing that its true is enough put anyone with a strong A-type personality in distress. (as someone who's kinda like that himself, I can say that feeling incompetent even after trying your hardest is one of the worst feelings in the world to someone like me) Her self confidence was shattered (twice), and her superiors were acting condescending as a result and not giving her the chance that she needed to earn her confidence back.
Now if she had been acting like a miserable little prick to everyone and crying about wanting to give up and go home like a true emo, then she'd need it, but as it is, she was perfectly justified in being upset, and what Signum did was out of line, especially for someone who's in a position of authority.