7 year old friends - need advice

[Hopeful22]

was hoping for some words of wisdom, ive a 7 year daughter and myself and dh are seperated 6 months now since he left the family home, kids took it very well, they were always much closer to me than him, so on the surface everything looks ok, but for the 2nd time now ive got a compliant , one from her teacher and one from a friend of mine about my DD being mean and trying to exclude one of her friends, she is in a group of 3 girls who are " best friends " but she has been accused twice now of trying to exclude one of the girls...
my DD overall is well behaved but she does get quite possessive of me, she has an older brother and if he gets any attention at all from me she says oh well you dont love me then, so there is definitely an insecurity there and this must be a fall out of the separation ,
ive spoken to her before about being kind to your friends and not excluding anyone but im obviously not getting through to her , any words of wisdom or anyone been through this before ? any help would be appreciated

It's very normal 7yo girl behaviour. Not to say it doesn't need addressing, but it's usual and I guess developmentally normal. My dd has been on the receiving end this year. It is horrible though.

I don't think the 'be kind' talks work, it means little to them. Address specific behaviour (mainly down to school unless you do play dates etc).

Encourage more positive friendships without this dynamic. Some are worse than others. Avoid the 'three' together.

Do they mix the classes? This happens every year and that's why most schools do it.

thank you, the problem is as well, that when i confronted her, she just denies it and says that the other girls are excluding her, which i dont think is true but so hard to know and of course i cant tell my dd that i dont believe her...