Blocking her is the problem...
Really? Explain
Blocking her is the problem...
The first option sounds like the plot to a murder suicide.Humiliate them. Make it unbearable to them every time they get close to you.
If you don't have the stomach to do as instructed above, then tell your friends that you don't want her near you and then just spend as much time as possible dodging her, with their help. Be clear when you speak to your peoples "I don't ever want to see so and so ever again, so every time she's around just either remember to let me know or just don't invite me".
You've got these two options.
Really? Explain
Especially if you’ve blocked her on everything yet she’s contacting you through mutuals, is emotionally unstable, threatening to come to yours and says she can’t live without you