How do you stop someone from ruining someone's life and the people around them

Because this person has a crush on someone's boyfriend and tried breaking them up didn't work and because of her coursing trouble for him they are no longer friends she wants to destroy his live and course trouble for him and lives of others and getting your children involved to get them to there house and you have had to tell your children to stay away .how do you deal with and sort it out if other people are also involved getting info for that person and being so sly what can you do about it with no proof or evidence.

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Sallysales33 · 41-45, F

How to deal with things in the right way as this person done prank calls.and reported people and it being all lies what's she is claiming. Says she was gonna go to police for him groppin her .getting other people to put pictures of him on Facebook and say nasty things .making up other Facebook accounts and spying on our Facebooks .trying to lure our kids into there house with showing them kittens and just a lot of other stuff we know for sure just no actual evidence with most stuff how to deal with it.