Hey @tjayne19, sorry about the lack of updates, I've been pretty preoccupied haha.
I did actually and I felt like I did a really good job with it. The problem was that she couldn't invite as many people as she wanted to and one of those people was me. She said she'd invite me to the next one though! I felt like I properly conveyed how I was feeling and got a result I was satisfied with!
I told her I was bummed that I wasn't invited because I really liked seeing her and her friends. I wasn't blaming/accusing her and therefore it wasn't a confrontational situtation. Plus, she asked me if I was still upset after the fact. Obviously I said no because I was satisfied.