Boss Fired Me Out Of Anger. Board Of Directors Is Asking Me Back

Location: California

Last week, my boss fired me out of anger. She was upset that I left during my lunch without telling her. Claiming she's "the ceo and needs to know everything". She proceeded to storm out and slam the door.

This was already the last straw as she had been yelling at members over the phone and in person. Two had already closed their accounts because of her. I decided to contact our Supervisory Board regarding this behavior in case she got worse. She finds out and sends a sarcastic message stating "thanks for contacting [board member] before talking to me".

She comes back into the office and confronts my coworker first if she had spoken to the supervisor. Obviously, it was not her and she comes to confront me. I told her it was me that spoke with him. She angrily asked why I didn't talk to her first and I told her because of the way she is speaking to me now that I was not comfortable talking to her. That made her angrier and she yells "you're fired". And does the same to my coworker.

Backstory, this isn't the first time she's done this. She did almost the exact same thing about 2 years ago, almost to the day.

I got my final paycheck FedExed on Saturday. However, the supervisor told me they were having a meeting today (Wednesday). Long story short, they are not firing her and want me to just go back to work.

My question now is... There is NO WAY I can work for that woman again. How do I go forward declining and still be eligible for unemployment? I have not returned the Supervisors call. Any advice help is appreciated.

Tldr: boss fired me, 6 days later supervisor calls and wants me to just go back to work. How to decline and still get unemployment?