She's in Year 8. There's a group of five of them who have been good friends for two years. I wouldn't say that dd has a special friend out the group.
Two of the group have known each other since primary school. Then dd and one of the others became good friends with them in year 7. The fifth girl joined the school in year 8 but they've all got one fine. No bitching or falling out at all.
Now another girl in their year seems to be latching onto the other 4 in the group but excluding dd. so she comes over to the group at lunch time and in front of dd asks the other 4 about coming to her house at the weekend. Which they all say yes to.
Its happened a few times. So then dd says they're either talking about what they're going to do at this girls House or afterwards talking about the fun things they did.
Dd has still sometimes met up with the other 4 at weekends. So its not like she's been dropped by them.
I've told her not to walk away when they all chat about their plans which it sounds like she has done. But stay there even if she can't really get involved in the conversation. Because at some point the conversation will move on.
I've also suggested a sleep over in the holidays. Would you invite this girl with the hope she might invite dd to stuff in the future? Or just invite her four friends with the hope of strengthening their bond?
I've told dd to tell her mates how she feels but she won't.