How would you feel if your manager on duty went full out psychotic mid shift?

This happened to me and another coworker on individual nights. My key holder manager has been acting erratic and saying things like "people are watching me in the bathroom", and "the store manager has taken my keys away from me", she kept seeing people walking out of the store without paying when it wasn't true, and the district manager was there when he wasn't. She left me in the store, ALONE and just drove off for 20 minutes on a Friday evening on a 4th of July Weekend when we were busy at all times, my assistant store manager had to call her and tell her to get her ass back to the store and close the store up for the night, and the keyholder told her she was going to blow her head off, then hung up. She then asked me, "What have I ever done to y'all"? I told her nothing, she was like Don't lie, and again i said nothing, because up to that point she never had. She then threw me under the bus when she wrote a note saying" I'm sorry but I tried and failed, but that I did jack shit" I mean , that's not true, I'm the fucking cashier, I handle most of the customers, I'm the face at the counter and the one that makes sure everyone leaves at least satisfied. What Did I do wrong? The rumor is that she was on halluengenics (possibly meth) while on shift. She had said she hadn't eaten or slept for 3 days at the time. She also accused me of laughing at her, honestly I wanted to slap her back into reality. I mean, what can I do? This is a manager, who couldn't even be competent to do her own duties. Her boyfriend ended up in prison for a charge of trafficking meth, and she's now with his brother. That's when the downward spiral started after she got with him.

How would you feel if your manager on duty went full out psychotic mid shift?
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