How to deal with fake friends

My supposedly BEST friend never asks to hang out and says she’s working but seems to always have time to hang out with my other friends. Idk why she never asks me and always organises group hang outs with others without me. How can I deal with this emotionally? I don’t want to cut her off because we’ve been friends for ages and I feel like if I speak to her about this she’ll just say I’m being stupid. 😕

And if you find out she isn't genuine, dont stress over it ,it is not your fault at all it is hers and she will be losing a very good friend. Best to know , as false friends are horrible people.

Maybe test her in someway ,see if it is as you think it may be. She may be genuine or may be two faced ,is sometimes hard to tell. I had a so called "friend" once, then found out they were trying to hurt me badly by putting drug in drink, putting marijuana in my suitcase etc and other stuff. Anyway hopefully you will test her and find out she is genuine, I sincerly hope so .