Agree, she is most definitely *not* in this marriage for money. IMO it really is love. They’ve been together for several years and have handled their lives with quiet dignity, unlike several other couples. In the fashion world, all sorts of ‘different’ situations are tolerated, so in that world, there is nothing unusual about the ages. None of his kids are bleating to the press about her. In interviews, she handles herself with grace and poise. Both are aristocrats with plenty of their own money, so all is well. As far as the Earl is concerned, if there is a falling out with Kitty, my guess is it’s over money. He has frequently complained about the lack of and the difficulty of keeping Althorp together. Let’s hope he has not been after Kitty for money. At the statue show, he did not look like he has aged well at all, so the injuries could be taking their toll. All the siblings were with her, so that says something.
Another possibility - due to covid, the ‘real’ wedding had taken place earlier. This could be a ‘wedding celebration’.