She seems to be having mobility problems, not surprising at her age. It’s one thing sitting at her desk looking through papers, or greeting visitors virtually. Quite another travelling to say, Westminster Abbey, getting out the car, walking into the abbey, then sitting and standing through a church service, then doing it all in reverse, to say nothing of greeting a line up of dignitaries. All the while under the scrutiny of the tv cameras.
I honestly don’t think she is bored with it all, more a case of the spirit being willing, but the flesh being weak.
Also don’t think the QM was ‘everywhere’ until she died. She certainly looked great for her age on her 100th birthday, but that was quite a while before she died.