The fact that very few people with no pre-existing health conditions have died is no comfort to Sheila who has a serious pre-existing respiratory health condition, so her view & anxiety will be different from someone who hasn't got a serious pre-existing respiratory health condition.
I think that she's right to take all the advice & precautions, which won't kill her if they turn out to be not needed, but could kill her if she ignores them & they do turn out to be needed.
That's how I see it, if it makes sense.