BBC story here
Prince Charles took her place at today's Order of the Bath service, on grounds tht HMQ could no longer cope with step stps in regalia. But the decision was only made last night, according to the Beeb, which seems very late on when these things are put in the day months in advance and the demands of the service are well known.
I hope it does not mean she is unwell, or that Prince Philip has taken a turn for the worse.