My employer gave my hours away out of spite, is this bad ethics and should I file for unemployment?

I quit my job in May. My employer asked me at 9:15pm after I was done my shift, to work the next day at 1:45pm. I told her my daughter had a doctors appointment at 3:00pm and I could come in when done. She asked if I could be there by 5:00pm. I said I couldn't state exactly what time but I would come in as soon as I was done. This is not my scheduled day, but I was willing to work. She stormed away mad, and gave my hours away to another employee out of spite. Is this bad ethics on my bosses part? Do you think I should file for unemployment? Please note; this is a restaurant that serves wine and beer in Florida. And she starts drinking around 5:30-6:00. So she acted this way while under the influence. And I spoke to her the next day and she still feels I was wrong.