I'm sure this is a common problem but I really don't know what to do for the best. My DD (school year 4) is in a friendship triangle. The "main friend" (A) and DD have been friends for a couple of years, and are on a very similar wavelength. The third friend (B) has been friends with A for a little longer. She is also quite similar to DD in her sense of humour and personality, so they have tended to get along well.
DD has always tried to be friends with both A and B. She has had playdates with B and with A and with A and B together. She invited both of them to her birthday outing. On this outing, which was just the 3 girls, I noticed a certain amount of A and B wanting to sit together, and I deliberately engineered things so that DD was in the middle of them - it was her birthday after all, and I felt that she should not feel left out on that occasion.
Recently, B has started to be mean to DD and to encourage A to be mean. This is low-level but persistent meanness: deliberately saying things that she knows upset DD, pushing her into a bush, mocking her appearance, choosing a lunch table with no room for DD. DD says that A tends to stand silent rather than join in, but obviously it is hurtful to DD.
I have suggested DD should simply ask B, "why are you being mean to me? I am your friend". Also, perhaps she could ask A "Please will you stand up for me, B is upsetting me". I've also suggested DD looks to expand her friendship group. There is a number of girls she likes, and sometimes chats to, but she does seem to have rather latched onto A as a "BFF" and is reluctant to walk away because they really do get along well together. Also, she feels that if she walks away, B will have succeeded in her attempt to "win" A.
I don't really want to get the mothers involved - I am on friendly terms with them, but not really friends with them and I don't want them to feel I am stirring the pot. I feel that the children need to learn to negotiate these situations themselves, but it would be nice to feel that those Mums were at least talking to their daughters about kindness etc and I have no idea if they do.
How would you advise DD?
Why do girls have this need to have a soul mate, which seems to be the cause of these toxic trios?