I am 73, last year I had pneumonia and whooping cough in April. Then in September I had pneumonia again.
I took medication at home both times and weathered out the pneumonia. I am still kicking now!! It was important that I did not just stay in bed, needed to be up and move about, helps the lungs.
If your mother takes care of herself, chances are she will be up and around before too long, living life as before. It does take time to get rid of pneumonia, just hang in there, be patient and allow the body to heal.
There are always risks from illnesses, however, the kind of health a person is in before becoming ill helps a lot in their recovery.
Your mom will need to rest a lot, so, please do as much as possible so she can rest. The body heals better when we get plenty of rest. Rest is necessary to prevent a relapse of pneumonia.