How do you know that she had any knowledge that the first check was a mistake? After 60 days, the stop payment period ends.
She might have been entitled to the money and Pfizer decided to retaliate for some reason. Would not be the first time that East 42nd Street slime did that.
I know too many people who were lied to or cheated out of money by them.
Until we see the evidence come out in a trial, I am with the employee on this one. If Pfizer was that careless with that amount of money, it's liquidated damages and they lose.