Tell them to stay strong, MN has already received some police attention from her recent harassment and this will help finish her off. Make sure you screen shot EVERYTHING and keep it safe. If you need to talk to someone about which police officer is dealing with her pm me and I can get someone to talk to you (sane and safe people don't worry).
Bullying usually works for her so she might ramp it up so be prepared for a deluge of crazy.
I should stress that the threat did NOT come from MN, but from a member of the PR FB page.
It is being escalated.