Chemo is hard! No way around that. Maybe when she recovers from the covid, she can resume some treatments. Covid is hard too, one of the foster girls that were in our home growing up just passed from it. If your mom is home and on oxygen, she is doing better than many and it might just be time that she needs to get past the lingering effects. The truth is, no one truly knows ALL of the whys and hows of why some recover and some do not. Some things change the odds but not guarantees. Love your mom every day while you have her and you won’t regret it regardless of the outcomes.