Friend hanging out with other friends

We have about 5 people and counting in our friend group. My friend, we’ll call her W, I was W first friend when she moved to our country. And this year she’s started hanging out with another friend group or the art rooms to finish projects, and she occasionally spends time with us. I want to clarify that I like her friends and I am friends with some of them. We don’t text often because we are both busy, we don’t have any classes together, but we use club time to catch up and it’s honestly like nothing ever happened (or at least from my perspective). Maybe she’s hanging out with them more because some of them are going to the same university she wants to go to. But my anxiety is telling me that she has a problem with someone in the group and that’s why she’s spending less time with us. Almost like distancing without confronting anybody. I’m sure that’s not the case tho and that it’s my mind playing tricks on me. Any advice or what’s your experience?

I have anxiety due to rejection from other friend groups without them explaining what I did wrong. So as much as this seems irrational, and I agree that it is, it makes sense when you see things from my shoes (almost like ptsd). I need a 2nd opinion to help me remember that not everything is bad