The only protection, and a dubious one at that, made problematic for you by your profession that I (a non-lawyer) can identify is a restraining order. And its only usefulness appears to be to prevent either indictment or conviction if someone in your position is forced to render the aggressor room temperature.

If you don't have a concealed handgun permit, get one. Licensure could reduce the inventory of potential criminal charges you could face if you are forced to defend yourself.

Document the threat as well as you possibly can. Keep a log and hard copies of emails, ads, etc. If you are forced to defend yourself against a murder charge the fact of your profession will suddenly become trivial. As the events play out you might want to consider recording on paper your thoughts regarding asking Law Enforcement for help.

And maybe she might read this thread and learn from it that you will shoot any assailant dead if he/she physically assaults you. Maybe then she will shift her baleful glare to a weaker target.