Is it normal to want revenge?

I have a horrible coworker that has targeted me in an attempt to humiliate me. I work inside homes. Somehow, my coworker got ahold of, or looked at my paystubs, unbeknownst to me or my boss at the time. She became jealous of my pay and has attempted to make me quit. One shift, I was so ill that I was vomiting for 12 hours straight (I was working overnight). I called off 2 days, and I had never called off before. The morning of the second day, she called me, swearing, asking why I'm not coming into work. More or less, I told her it's none of her business, fuck off and I hung up. She called me a second time to "apologize", while telling me to have fun on my day off.

Another major incident happened a few weeks ago. She left a bag full of shit on the bathroom counter, as well as smearing shit on the toilet lid and bathtub. Keep in mind, the bag of shit sat in a closed, heated bathroom upwards of 6 hours. She left it for me to clean up. Because of the nature of my job, my initial assumption was that it wasn't done on purpose.

Fast forward to today. Crazy bitch of a coworker quit, and in a weak moment, admitted that she put the shit in the bathroom on purpose (and it was likely from her).