Moderators on such a large site clearly have their work cut out for them. Many members of MN have suggested @MNHQ fund the small cost to train their moderators to spot and deal with coercive and controlling behaviour. Such behaviour constitutes violence and abuse that leads to mental health issues and feelings of worthlessness.
The Freedom Programme have lots of information online www.freedomprogramme.co.uk/training.php
I believe this training would be beneficial to your staff not only in FWR but across large swathes of Mumsnet.