Update on my friend's condition:
She used to love going hiking, but now she can't walk a few steps without being out of breath, her head being covered in sweat, and her heart going nuts. She's walking around with a heart monitor and getting medication. I asked her if she is noticing day to day improvements, but honestly, she's not. (Got to appreciate Dutch directness. If you ask a Dutch person how they are feeling, they will be brutally honest with you.)
Each day has its ups and downs, but there is not a feeling she is improving at all. She must have gotten it at her poorly ventilated office in Ireland, which still operates as if nothing is going on. At least she can work from home now. Meanwhile the office continues with the bare minimum of caution: some social distancing and screens between desks, but still poorly ventilated. So many of her colleagues have gotten sick too. I don't know if this is how most businesses in Ireland deal with this pandemic.