I agree with her. She is hardly going to be spreading the virus around, she and family can self isolate in Devon and feel more relaxed. Prince Charles is in the same boat. It may engender ire from those who do not have somewhere else to go but that's life, some are better off than others. They aren't flaunting it, just saying.
They are not the sort of people so castigated - rightly - on here who are going to possibly drain local resources and go out, eating, drinking, shopping & potentially spread disease in the area surrounding their country home.