Destroy the life of the individual. Get them fired, banned, or killed.
Many employers will just bail if they start getting mail about someone. And that puts a permanent black mark on the persons name. No one wants to put their name or company at risk.
Another trick is to have someone make something up and have the SWAT team show up. In case you don’t know, many SWAT teams kill first and then try to figure out what is the real situation later. Rand Paul’s house is an example, but lucky for his family someone ran the address before assaulting the place.
I wonder what are the horrible things that are being sent to her - I’d like to see some examples.