In my mind, I really don't even see any reason to believe that there is significant bad blood between the actual employee that was fired and FSF. The only side of this story that we have is Leah's and she's already outed the ex-employee, slandered 3 people in every way she can, and either the fired employee changed her mind about supporting Leah's actions, or Leah made that up as well.

At the very least, I think we can conclude that the FSF and the fired employee are unhappy with Leah's actions.