I met my friend at a baby group when our kids were little and they are now in their late teens. Our eldest DDs have been friends on and off since then, sometimes in the same friendship group and sometimes not. Until recently they were in the same friendship group of 7 or 8 girls and her DD fell out with one the girls in the group. My DD along with some others have tried to remain friends with both girls but her DD insisted that if they continue to remain friends with the other girl she won’t speak to them. Long story short, they have continued to stay friends with that girl and her DD is no longer speaking to them, but it’s particularly my DD she has targeted. If she walks past her on the street she completely blanks her, if they go to the same place on a night out, she bad mouths my DD to other people and she posts pictures of herself with my DDs ex on social
media cuddling up to him. My DD was initially very upset but has decided to just keep away from her and has her own group of friends so is ok. Some context - my DD isn’t the first person this girl has turned against in this way. Unlike my daughter I’m still pretty mad about it. I raised it with my friend who excused it by saying her daughters going through a hard time but then also suggested that what I said couldn’t be true as her DD had denied it. I’ve always had a very close relationship with my friend but I am really finding this difficult. My loyalty is with my DD and I feel that she shouldn’t have been treated that way and I’m struggling to get past it. When my friend talks about her DD I find it very hard to bite my tongue and listen. I just want to say I’m not interested. Aibu? Am I being petty and childish or just a concerned mother?