Of course, the assumption was not far-fetched.
So, it would be reasonable to expect the princess to attend.
Only Kensington Palace has the authority to make such declarations.

But that, too, seems unlikely.
Despite Kate’s absence from the event, an anonymous source toldVanity Fairthat the princess is improving.
“[She] turned a corner.

It has been a great relief that she is tolerating the medication and is actually doing a lot better.
It has, of course, been a very challenging and worrying time.
Everyone has rallied around her William, her parents, and her sister and brother.”

However, another source cautioned, “There is no timeline, and there is certainly no hurry.
It will be when Catherine feels ready.”
It’s getting pathetic at this point."