I’m covered as well as I can be without retaining a lawyer. We (my wife [her sister] and I) saved a lunatic voicemail she left about 6 months ago with various threats and bizarre statements.
I do have a couple of additional family members that would testify as to her veracity, mental stability etc.
Under the circumstances, a restraining order is essentially impossible.
Fortunately, she is supposed to be leaving the state in the next eight weeks and putting her house on the market. She owes her ex money she doesn’t have which is due in a couple of months. She needs to sell her house to pay him, and then she will have to go live with her other sister...far far away from us.
It also is good that my wife trusts me 100% and is behind me.
It certainly sounds as if the likelihood of needing clear evidence is much reduced. The value of such evidence, should the unlikely happen, would possibly be very great.
I would be keeping some kind of diary of anything that might be relevant. It's somewhat intimidating that our emails are available to the government or others with a simple warrant if even that. The upside is that anything you email to yourself would be date-stamped and archived.
Good luck.