So, just to make sure I have it right, it's perfectly okay to get people fired as long as they're acting "unprofessional" when not at work.
The allegation is that she went out and dragged her employer into this fight herself which then caused material damage with the time and resources used to clean the spamming up. IF that is true then she acted unprofessionally and it is grounds for dismissal.
If people just found out who/where her employer was and dragged them into the fight themselves, then there really is no reason to blame her for it, and no reason to fire her.
Make sense? I'm rushing because I've got to go.