I think you've gotten some good advice. Here's what I know of COPD - my aunt has been in the hospital for three weeks due to congestive heart failure from COPD. What people who haven't gone through this don't understand is that COPD is a horrible way to die. When someone has this and later has a heart attack or an infection and needs oxygen, there is only so much oxygen that can be given because the lungs are so scarred and stiff that they can't push the CO2 back out. So if the person gets too much oxygen, the body becomes saturated in CO2, which inhibits brain function to such a degree that the heart stops, breathing stops and they die. So the oxygen being administered has to be kept fairly low, and then the person struggles to breathe and slowly suffocates to death over several days, feeling short of breath, coughing, and in pain...or so zonked on meds to control those symptoms that there is little presence or quality to those days. My aunt isn't that old (72) but has been in the ICU for most of her stay. She was transferred to a regular floor for a few days and then to a cardiac re-hab for a couple of days before landing back in the hospital yesterday in much worse condition, now battling C-diff and a UTI. It's so sad to see her decline so quickly, and she gets so worked up whenever someone comes to visit and it worsens her breathing so she spends most of her time alone with family having to visit briefly and worry from afar.
I really hope that after your mom recovers from her pneumonia that you can have a serious conversation with her. There's no such thing as "a little COPD" - it's a horrible, progressive, deadly disease that is almost 100% preventable. Hopefully she'll quit smoking and will stop the damage where it is and go on to live a long, healthy life.
To compare a smoker and non-smoker, my non-smoker 93-year-old grandmother-in-law had pneumonia, a heart attack and kidney failure at around the same time my aunt had her congestive heart failure. She was moved from the hospital to a rehab after 4 days and moved home yesterday. The pneumonia took a few days to clear, her kidneys started recovering once she was hydrated and she has to now see a cardiologist but otherwise has a clean bill of health. She was able to recover even at her age because she can breathe, and she can breathe because she doesn't smoke.
Best wishes to your mom as she journeys forward.