It’s why they wanted out - or more specifically Meghan - because of all of the work they were actually expected and required to do. Apparently she thought it was all wealth, glitz, and glamor and not having to work.
There’s no excuse for that. I’m sure she was made well aware that she was marrying not just a man but an institution, and that things would be expected of her.
She just didn’t have the stuff. (Claims to be an actress, but flunked at the role of a lifetime...)