Sorry I think my post is a little confusing.
So my DDs friend's mum (I'll call her Perri) has actually come to us, as her friends, for support. We usually do group days out for the girls as we live in a city that has alot going on, so whilst they go out alone, we also do group days. Perri has reached out to a group of us, as mums, highlighting what is happening. She has also reached out for some advice. When I catch up with her, I will let her lead - and share my own experience, but not from a point of view where she must take it (to your point @purplecorkheart)
My DD has been telling me that she is aware that her friend (lets call her Gina) and Perri (her mum) have had issues. The school has got involved. She has been doing some things online affecting other kids. It has gone on for about a year now. I know divorces can be messy.
I don't want to over step, but like other PPs have said, I parent my child based on her personality, what I know that she can handle, with a pinch of what I thought was missing from my upbrining that caused issues later on down the line - and I can be pretty strict and have very firm boundaries. Perri has told us mums in the past that she struggles with discipline, she is known as the softer mum between us - we don't judge - we just acknowledge that we all parent differently. But I'm guessing she is running out of options and has come to us - sometimes you need your "village" - @LadyMacbethssweetArabianhand - whilst we wouldn't get involved - shes asking for help.
Perri did ask one of the other mums to have a word with Gina - but it was forced, I don't think that went down well with Gina at all.
Something I value is transparency, especially in the age of social media where you can just find answers elsewhere anyway. So I am keen to advice some level of child friendly transparency could help - only she knows her daughter. I also know what its like to be a UK student, feel the pressures of a divorce and act out - so I can give that view point.
@Buscake , you told your children more than I was told - and I would have appreciated just that. When I split with my ex I told my DD the child approproate version, I am sorry you went through abuse, but on my side we still speak to my ex, but she understands that there was a break in trust without knowing the adult details. As I said, when I witnessed my parents divorce, I had zero insight, my life changed over night, didnt see my dad again in 20+ years - and whilst I know their situation is different, I guess I'm trying to guage from others on MN what they may have gone through and maybe what they would have wanted from their wider community.
@TheGrimSqueakersFlea I have only got involved when my DD tells me "I'm going out with Gina", but sometimes my DD comes to me asking for advice because she is concerned about her friend - so I responsed accordingly. Mainly Gina does hang out with a few of the boys you wouldn't want your DD with (this is what my DD has said) - again, not gossip, but safeguarding as I want to know who my DD is with, and ensure she is back home by a certain time. We have tracking anyway, and one of the boys attacked a friends DD a year ago - so you can see why we are wery.
Thanks to everyone else that has give their POv, its helpful to know.