Not sure whether to get involved with this or just leave them to it.
To cut a long story short one of my twin DDs had big problems with a particular girl at primary, I'm friends with her mum and it was all very awkward. This girl was obsessed with DD and wanted her to herself, DD was suffocated and wanted other friends and it all got a bit nasty with other friends ostracising this girl because of her funny ways with DD.
Moving on they are thankfully at different secondary schools. I'm still friends with mum and they do see each other occasionally if we meet up but DD hates it because of their history so I limit it and tend to meet the mum on her own.
Both my DDs have been talking about Halloween and making plans to go trick and treating with various friends. This girls mum has been texting me asking what my girls are doing and I've deliberately been vague, saying they are making their own plans this year, which is true really. She keeps asking me though and says she is going to get her DD to text mine as she wants to join them. DD says her being there will completely change the dynamics of the group, she'll cling to DD and other friends will go off etc etc.
Part of me thinks bloody hell it's only one evening, get on with it particularly as this girl struggles with friends. Should I force DD to be kind and involve her. DH says absolutely not as it was that attitude and DDs kind nature that led to all the ishoos at primary.