No, I don't think it had anything to do with revealing the truth. She just felt "not in control." That was not the first time that she went nuts on the staff, screaming like a enraged animal. More likely, she was stressed over some disappointment. Like, whoever she laid her most recent giggly, gossipy (fake news), delayed adolescent charm on, didn't buy into it. Like a truly qualified candidate got the job that her little opportunist mind was set on.
Is it too much to ask to be able to come to work sans the drama? For tech's to work in a quiet are without the constant opening and slamming of her office door as visitors and employees go back and forth. Sometimes it sounds as if you are outside of a carnival madhouse.TRYING TO WORK. She refuses to give M.O. her office and move to a more appropriate place in the lab. It is the Cytology Dept Supervisor's office for goodness sakes.
Now, she does have her sycophants. They behave as if she will wish them into the cornfield (remember the Twilight Zone episode "Its a Good Life.") Watch the behavior of G.P. and become a witness. You will ask your self, "is it Stockholm's Syndrome?" because they have to know that she is crazy as bat shyt. Is crude and belligerent behavior, spreading lies and rumors, attention seeking, creating dissension between employees acceptable for any employee, let alone a so-called lab manager.