Mrs C never had a cough or fever according to Mr C - so she didn't have Corona?
Well, in that case she should have been isolating from the start of DC's symptoms, and shouldn't have gone to hospital.
However, that is really neither here nor there. She is not a politician or government advisor, so what she does or doesn't do is none of our business.
Strictly speaking, though, DC should not have gone to collect them. Although, I guess, if he thought they all had CV then it does make sense for him to do it rather than to ask someone else.
I'm unsure how on the evening of the 2nd he was so unwell he couldn't stand but by the following morning was capable of driving his car, though. I reckon it is a magic car.