So I am glad to hear you are in a much better place. Congratulations on that. Eventually she will leave you alone. All you can do is go about your business and never respond. The best thing is that you are already doing what is necessary...you are living well. Continue to do so and don't give her any thought. You can only control YOU. You can't worry about what others do or are going to do. I definitely get the frustration though. I still remember when my ex wife showed up on my doorstep randomly after being divorced for 5 years...yeah wasn't too thrilled with that. I had to verbally eviscerate her for her to "Get It" basically. - I do not recommend my course of action to everyone btw.
Oddly enough I did come to find out my ex wife lives in fairy tale land and still paints me out to be the bad guy...as fate would have it she got her hair done by an ex-girlfriend of mine who I've been friends with a long time...she told her that I cheated on her and that is why she will never trust again, etc. LOL. Funny story and goes to show you that yes indeed it is a small world after all. Ha.

. I'll keep my story short right there as to not take away from you my friend. Just relating and letting you know I understand the struggle is real.
Cheers and best wishes to you!

-SC-