My mom was treated for COVID at Apollo, and we asked the doctor to discharge her while she was still on 2 liters of oxygen. After a few days at home, I managed to reduce the oxygen to 1 liter, but now I'm noticing something concerning. Her SPO2 levels are showing around 92-93, and her pulse rate is between 105-120. Could you give me some advice about this situation? It has me a bit worried.