Some people are saying that she shouldn't go because she is not a working member of the royal family. This means that she doesn't have an official role to play in the ceremony.
One person who has spoken out about this is Paul Burrell, who used to work for Princess Diana. He said that the coronation has "nothing to do" with Meghan and Harry, and that he would prefer to watch the ceremony without them. He also pointed out that the event is about the monarchy and the country, and that it has a long history that goes back over a thousand years.
Burrell suggested that Harry should attend the coronation, but that Meghan should stay in California with their children. He explained that since Harry is the King's son, he has a place at the ceremony, but Meghan does not.
Overall, it seems that there are differing opinions about whether or not Meghan should attend the coronation. Some people believe that she should be there to support her husband, while others think that it would be more appropriate for her to stay home.