I am glad she got to see the show, it was lovely to see.
I don't think the two visits are comparable. I would find a trip to London, entering the chamber, presumably on foot, addressing parliament live, getting back out, and being driven back to Windsor, all very tiring and I am only 55!
The show is literally in her back garden. She was driven the extremely short distance and, from what I can tell, didn't exit the vehicle. She would have been back home again in a matter of minutes.
BTW - I have never questioned the Queen's sense of duty. After losing my mum and having an extremely quiet funeral, cut off from much of the family, I appreciated when she was dignified in seeing her own husband off whilst also following the rules. It made me shed a tear and feel less alone in my situation, seeing her as alone as I had felt, little black mask and a tear.
Can't say the partying of the politicians made me feel like I was joining people in sharing in the duty to keep everyone safe.
BTW - it was the first time she had missed it in 60 years, and she sent 2nd in line to the throne to act on her behalf. Not sure what other job would ask that of someone, not that I think it is just a job. It's not one I would want to do anyway.