It would be interesting to hear the whole story. I have been severely mistreated in jobs, but have never done anything...I just left. In this case, it might have been cheaper to keep ‘er. Very foolish behavior on her part for many reasons.
I set off several Dumpster Fires in corporate when I left my last job.
I messed with corporate and benefited hundreds of employees for violation of corp written rules.
Even got my branch mgr, district mgr and regional mgr written up.
One dumpster fire got the regional safety mgr written up.
*They tried to fire me, but I was able to leave on my own terms.