My Best Friend Isn't Invited to My Grad Party...NOT MY FAULT..

There are just times when people can’t control the situation. A ton of my mom’s friends decided they are going to host a graduation party for me (for just the people that my parents were friends with when I was born), and they made a list of who to invite. It’s a really fancy place, so if your name isn’t on the list, you can’t get in. Unfortunately, my best best friend’s name isn’t on the list. I asked them why, and if they could add her. They said (in a really nice way), “we don’t know her, and we want this party exclusive for the people we knew when you were born: just my mom’s friends, and my blood family.” I didn’t have any say… My best friend and I have been close for almost 10 years now. We have become family, but not everyone knows that… meaning, the people who are throwing this party. Now my best friend found this out, and she told me she couldn’t believe I would agree to celebrate my graduation without her…Her family always invites her to events, but they don’t invite me, because they don’t really like me… but my best friend always tells them, if she can’t come, I won’t go. She hasn’t spent time with her family for a long time. I think she feels that I owe her something. She is really upset at me, and she feels like I’m betraying her. She feels like I fooled her into thinking that I really love her and will always be there for her, but I really do love her and I will always be there for her. I feel like this like a surprise party for me… I’m blindfolded, and someone is leading me somewhere, then the blindfold is taken off, and “SURPRISE!” It’s not like it was my idea of who to invite… but should I have done my part and said “no” to going to this party? All my mom’s friends are asking is that I show up. I don’t have to stay for the whole things. I know they would have it whether I was there or not, because they want to give me financial blessing, but that’s not the point. Any other opinions?