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I am sorry to hear about this situation. Unfortunately, the board is correct - being mean is not something you can sue the employer for. The best that someone in your situation can likely do is to claim that there was harassment in the workplace which left you no choice BUT to quit. This is important, because if you file for unemployment, the state will see that you quit, and you would be disqualified from unemployment unless you can show that you had no choice but to quit due to harassment.
Now her attacking you was of course not proper. And you could have filed a criminal complaint at the time. However since this happened earlier and you had since quit, filing a complaint now may not lead to anything as the police may simply see this as retaliatory and not true.
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