Please help me work out if I am being over sensitive.
Friendship group from children's primary school initially, but now very good friends of four years. We have lots of nights out, coffees and lunches at each other's houses. We have supported each other a lot over the years, and it has been great.
Four weeks ago I invited everyone to my garden for a late lunch at the end of this month - it is a delayed birthday celebration/ good excuse to get together. Everyone accepted and was really excited, it took some time to organise a good day for everyone.
Friend A calls me last night and tells me she can't make it, fine no worries. She then goes on to tell me she has organised a dinner the very same evening for twelve people. She has invited one half of the group (plus a few extras that are not part of our group) but not the others. And she hasn't included me either 
which was awkward on the phone to say the least! I am not sure what she wanted me to say, I was just quite gobsmacked, so I said no worries, lets reschedule and left it at that.
I have since cancelled my lunch on that date, as it is going to be too awkward with half the group going to the 'after party' at friend A's house, and the other half left uninvited! The others do not know about the evening dinner yet.
I will meet them individually instead now I think.
To think she is a CF? Or is this okay?