Hi Kiki...It has long been known(and suppressed) that lack of thiamin, a B vitamin, is the major core reason for congestive heart problems. Congestive heart problems are just one of the symptoms of beri-beri -- which is a disease caused through lack of thiamin in the diet. To cure this heart problem your mother should supplement at least 100mgs to 200 mgs thiamin per day. Your mother should also take B100 complex once a day, selenium(200 mcgs twice a day with meals) and cysteine(600 mgs per day with meals) for the edema issues.
To directly fight off and cure the pneumonia issue, you can use a fine mist sprayer or atomizer(like a perfume sprayer) and get your mother to inhale(10 times 3 times a day), through the mouth, a solution of 1% Hydrogen Peroxide using this method. If you prefer, you can use a simple and cheap portable nebulizer and use this three three times a day -- for five or ten minutes. This will act to rapidly and directly kill off the pneumonia pathogen in the lungs. You could also try inhaling sodium bicarbonate or colloidal silver or potassium iodide or turpentine vapours -- these will also kill a huge range of pathogens in the lungs.
My favourite method is using pure gum turpentine which has a highly active killing range for most pathogen species. But be aware that if you do use the gum turpentine -- the vapours are strong and might cause coughing. If this happens then just dilute with a little water. The way I do it with pure gum turpentine is just by putting a half teaspoon of pure gum turpentine in my mouth. I then carefully breath the vapors from my mouth into my lungs. Do this for about 5 minutes or more. This method rapidly resolved a long, ongoing and serious coughing problem that I had for a while(I had the cough for 4 months) which nothing else could cure.