If you are going to continue to have to see this person, you need to speak with an attorney in your area for help; a letter from the attorney to cease and desist, consider a criminal complaint for threatening, harassment, etc. and/or a civil lawsuit seeking relief. You can move your horse somewhere else to avoid this situtation. Have your documented her actions, recorded on audio or video her language and actions? See legal advice. Life is too short!
I am trying to give you a general answer to your question. We do not have an attorney-client relationship by this response on the avvo website. I have not been retained to represent you. I am licensed to practice law in Kentucky and in federal court in this state and the Southern District of Indiana. You need to seek legal advice from an attorney licensed to practice in your area..