I don’t know what Latin country you are in, but I am in Juarez Mexico and the Elders don’t dare do something like that here. All we have to do here is give the police a couple of hundred dollars and you will never hear from those elders again.
Even in the U.S. elders will not hound a publisher like they are doing to your sister. They just want to meet with her to formally disfellowship her. She needs to stay far away from them and use whatever legal means she can in that country, to protect herself.
They don't play fair, she shouldn't either.