I know these issues come up here quite frequently and I've always totally agreed with the advice about parents not getting involved in friendship issues.
However, I am at the end of my tether and getting to the point of being really worried about my DD who is in year 12.
Since year 7/8, DD has been part of a group of 5. This group was DD and her best friend, another pair of best friends and another girl. The other girl - I'll call her B - has always clearly had an issue with not being anyone's 'best' friend, even though they have always functioned reasonably well as a group. Over the years I have seen her try to come between my DD and her friend, mainly by just inviting one of them to events with her, making bitchy comments, and being generally quite manipulative.
Anyway, last year, this all calmed down as B had a boyfriend and she pretty much withdrew from the group and prioritised her boyfriend over the girls. The remaining 4 got on just fine.
However, B's relationship broke up last autumn, and since then, B appears to have done everything possible to separate my DD and her friend. My DD has backed off, and although has been very upset, has seemed to unable to stop B pulling this friend away, regularly posting on social media about all the things they are doing etc.
She's come home in floods of tears again today, but she is so angry with B that it is starting to worry me. There is no way she even wants to get more involved in anything where B is present, a she thinks she is nasty, manipulative and bad mannered. From my observing of B over the years, I don't think she is far wrong.
Anyway, I have finally reached the point of thinking I should have a chat with DD's friends mum as a last ditch attempt to see what can be done, at least to take the heat out. I know her fairly well, and my DD was practically part of their family for such a long time, taking her on holidays etc.
I'm desperately worried about DD. If speaking to the mum isn't right then what the hell do I do?