Would you be annoyed if your friend did this to you?

[Louise]

Me and my friend have been friends for years,im godmother to her son,bridesmaid at her wedding.
Recently shes got really close to a girl she works with and has been going out with her group of friends(not bothering to ask me,although i always invite her out when i go out with other friends)

Her divorce came through this week and shes posted on her facebook "out with the girls on sat to celebrate my divorce woo hoo"
She hasnt bothered inviting me along on this night with the girls ...yet she still texts me but now she got in with this group of girls its like im not needed to go out with anymore she has them.
I supported her threw her divorce and i feel like i dont want to bring it up with her because she should want to invite me in the first place,i shouldnt have to explain because its common sense.
Am i being silly ?i feel really let down