BBM - The Russian Roulette of beef wellingtons perhaps? Lucky Erin.
I agree that Erin seems to have gathered people around her that she could manipulate in a way, and if that proved difficult she'd push back and over power them.
* Her children are underage and in her "control" so to speak. At least for now.
* She had a "woe is me" attitude with her in laws during all those message exchanges, whereby she tried to manipulate them into seeing her side.
*She had a handful of online friends who didn't seem to call her out on anything.
*She got hostile towards Simon when he stood up to her and then called HIM out as problematic.
That seems to be the extent of her circle, despite being involved in church, producing the local newsletter and whatever else she may have been a part of in the area.
The people she didn't appear to have a relationship with could be seen as quite telling:
*She has one sister who she appears to be estranged from, no mention of any nieces, nephews, aunts or uncles from either side of her family.
*No old work colleagues she stayed in touch with.
*No friends through the kids school.
*No neighbourhood connections.
*No real life friends.
Only a handful of people close to her. I also have a small circle around me, I chose that because I've had enough drama and BS in my life and just want a quiet life with those closest to me I can trust. My personal choice, nothing more. I'm a no drama llama! Erin could be the same, but I personally think she may have alienated herself from people in her life, until she only had family left, and a few online friends who could be at arms length if they chose.