Was told to stay away
The RF really didn't want her and Harry together near the coronation for fear she might cause trouble. The entire family is angry with Harry for betraying them through his book, the documentary, and the Oprah interview, and William is so mad he's ready to punch Harry in the face. They particularly don't like Meghan because she was the one who started this mess and continues to embarrass them to this day.
They deliberately engineered it so that the coronation fell on Archie's supposed birthday, forcing Meghan to choose between being a grifter for Netflix overseas, or being the mom she pretends to be. She and Harry had a lot of ridiculous demands, like wanting to be on the balcony, be in the front row, participate directly in the ceremony, etc. The RF refused all of the demands and made their own, knowing Meghan's ego would not have room for such rules. Word on the street is, she was finally bribed into staying in CA by being allowed to tell everyone her fake kids are a "prince" and "princess," and was probably given money to keep quiet on coronation day.
Charles still wants to reconcile with Harry, and basically, the RF won the battle against the narc beast by getting Harry to the coronation without his master. They know he wants out of the marriage, but feels trapped, so they're working carefully and quietly with lawyers to wrest him away from her. A lot of the private war with Meghan has been put on hold because of the coronation planning, though now that that's over with, I suspect the war will heat up again.