My son has lung problems, our medical aid refuse to cover his chronic medication or lung specialists fees (he has a few dr's) so I feel your pain.
The bills are extremely stressful, one whole salary goes to cover those bills, and we scrap by on the other.
Wish your mom all the best.
Would suggest you check out iodine supplementation - found my son was completely deficient in it. All the meds he is on wipe out his immune system much like cancer treatment. Because of the meds, certain nutrients can't bind or be ingested B12 etc etc.
Worth looking into that too.