The thing is you did know it was wrong, you've been told before and most likely she was telling you to go home and you refused to listen until she got mad and told legal steps of informing the higher ups and you were fired. Had you listened when people were asking you why you returned( verbal cues that your behavior was abnormal) when she told you to leave( not looking up to her but not listening to her words) you had been given cues and words to shape up but you refused to listen.