Sorry this is long. Am a regular but have NC as this is outing and sensitive. Please be gentle as I'm doubting my own instincts here quite a lot and I may be being precious but I'm quite upset.
I have an old friend (20+ years). My DD and her DD have been very close friends for about six years. We've been on holiday together, loads of playdates, sleepovers etc. They are almost family.
The girls are now 11 (my DD) and 12 (her DD). Not surprisingly, they've come to a bit of a crossroads: her DD is now at secondary and on the threshold of puberty and is trying to be more independent and I sense is pulling away from my DD who is in year 6 and slightly more childish.
All fine and understandable. I've been trying to gently prepare my DD for this for some time and suggesting indirectly she may want to become less reliant on this girl as I could see the writing on the wall. Up until now this has been managed reasonably well and I thought they were slowly but amicably drifting apart.
This week her DD apparently out of the blue sent my DD a slew of really nasty WhatsApp messages (my DD has a phone but with no internet and a limited selection of pre-vetted numbers on it). Accusing her of being a "snitch" and a baby, saying she needed to grow up and that none of her other friends were as childish as my DD, threatening to exclude her from another separate chat thread with a third friend, saying the other friend didn't like her. Really mean and sarcastic when my DD apologised and said she didn't know what she had done wrong. My DD is completely perplexed and very very upset.
As far as I can tell from my DD, what's happened is that a couple of months ago my DD felt the other girl was being rude and unkind to my DD when she spent a couple of hours at their house. My DD was upset and told the mum (my friend) that her DD was hurting her feelings and making her upset and she wanted to go home. It was probably a bit childish for her to have involved another adult in a children's disagreement and I can see why the other girl was irritated but I don't think it merits the level of bile this has prompted from the other girl, certainly not more than two months after the event.
All the other interaction they've had since then has been friendly and non-eventful (albeit they haven't seen as much of each other) so this is out of the blue but that is literally the only thing I can think which could have triggered it. I have checked my DD's phone and there's been nothing else to merit this, just routine back and forth between them. The other girl has been to my DD's birthday party since then without event.
My friend has now sent me a text semi-apologising for her DD's behaviour this week, saying she hopes my DD's feelings aren't hurt but its down to hormones and she doesn't want to get involved and wants to leave them to it.
I can sort of see her point about not wanting to get involved: I do think children need to learn to fight their own battles and that a parent's involvement in squabbles can be counterproductive. Her daughter can't be forced to be friends with mine.
But in this situation I don't think this is good enough. Her DD's behaviour has been extremely upsetting to mine, borderline bullying. If there is something going on that I'm unaware of, she hasn't taken the trouble to tell me. While I do accept her daughter's right not to want to be close friends with mine, I do think the DD owes her a proper apology and an explanation for this behaviour. I also think if my kid were doling that kind of behaviour out to another kid I'd want to know what was going on with her.
I'm very conscious of not wanting to cause a rift with the friend, who I love and respect, want to support her if anything is wrong and also conscious that I may not know the whole story. But I am pretty pissed off on my DD's behalf and don't really want to put her through any more of this treatment. I'm not going to cause a row in the short term as I don't think its helpful but AIBU to want to give the friend a wide berth for now too as well as the daughter?