[choeger]

That's not too far fetched. It is well known that heart and, obviously, lungs are affected by COVID19. Add to that a potentially week long sickness and I am not surprised your friend is in a bad shape. Compare this to coma patients, for instance.

The question is: Is her condition chronic? That is, given a good treatment, diet, and specific exercise, could she return to normal? What did she do after recovery?