My sister had every risk factor - obesity, blood clotting disorder, COPD, and is a cancer survivor. She is on o2 24/7.
When she got Covid in Jan, we were all pretty worried for her, but she was determined not to go to the hospital. It took her 2 weeks to beat it. she said she sat in one chair with her oxygen, and did not move as her says would drop. She did not do zinc, vitamins d3, ivermectin or anything we suggested, because she didn’t want to have to deal with adjusting her blood thinner. Anyway, glad to say she came through ok, had a few weeks of fatigue but doing great now!
Great to hear that about your sister!