Usual disclaimer: not in UK so terms and school system a bit different
DD1 has one "best friend". They have been joined at the hip since they started school on the same day 2 years ago (their birthdays are two days apart and you start school the Monday after your 5th birthday). They've always had an interesting friendship - more like sisters - quite a bit of petty sparring, but god forbid anyone should even hint anything bad against the other. They come out of class together and absolutely have to walk down the hill together, as though they haven't spent all day together. I've become quite good friends with the mum too.
Best friend has had an unsettled year as her adored grandmother died and she's taking it hard. Her little sister has recently started school, so that has unsettled her a bit. We're also moving away in 6 months time and both DD and the girl have been very upset when it gets mentioned. They were both also very upset when the girl was away for over a month around Easter for a family wedding and travel.
The problem is that the pettiness seems to have got worse - or DD1 has become over sensitive. Most days I collect her from school I get floods of tears and "Annie (obv not real name) was mean to me" or "Annie said she can't wait to the weekend to get away from me". Any time DD1 comes out of class without her homework book or drink bottle, the reason is "Annie hid it".
I'm not 100% sure that all of it is true. Sometimes may be DD1 being over sensitive, sometimes Annie is a convenient scapegoat for DD1 having misplaced something.
DD1 has told me that the teacher has said that they are old enough to sort out these problems by themselves, but DD is coming out of school 4 days out of 5 crying.
DH reckons I should talk to the Mum seeing as we are friends, but I think that could only lead to awkwardness and seeing as it is happening in school time I wonder if I should discuss it with the teacher, rather than letting it go on any longer.
I've always been hands off when it comes to DD's friendships and tried to suggest ways she could handle things herself, but WIBU to ask the teacher if she has noticed any problems and ask if she could step in?
(Gosh, sorry, that rambled on a lot!)