Understood bro. And totally understood. I'll be the first one to tell you that Shang-Chi isn't quite a top tier player in the Marvel Universe right now. He still needs to develop himself. And I still think he left on somewhat bad terms during his last encounters with Iron Man and Captain America. There would have been awkwardness (well even MORE awkwardness) at the Hellfire Gala if Shang appeared.
Still, I would have liked to have seen Shang's Hellfire Gala look. Maybe he could have gone daper in the same vein as Steve Rodgers or perhaps worn a blend of traditional and modern styles.
Maybe she's an ancestor of Zheng Zu? Maybe a rival?