I am very sad to hear of this situation with your friends mom, and while there is always hope, it appears to be very late. I have been through this myself with my wife.
One main reason that her organs are not functioning is the morphine. Unfortunately, without it, the pain would likely be unbearable.
While I am not a doctor and certainly not an expert, the cancer is a minor threat at this point. The organs may be failing because of the long term effects of chemo and radiation.
1) stop the collapse and organ failure
If the person has not been urinating, then dialysis is probably urgently needed. The toxins are building up in the body and need to be removed. It may be so bad that the kidneys just can not handle it on their own. If so, they will fail quickly. Sometimes, spasms as caused by low magnesium rather than too much potassium. The kidneys absolutely need potassium to do their work. So does the heart.
The same is true for the lack of bowel movement, which is also necessary for the removal of toxins. My thoughts are that
Epsom Salts could be of benefit but only if the person was conscious and willing. Also, tryptophan may help bowel movement.
2) repair and recovery
NO Sugars!
Once kidney and intestinal function return, then it is important to supply copious water and minerals. Real Cranberry juice ( not the
Sugar water stuff ) tastes bitter but can be very helpful.
Essiac Tea given a couple of times a day and green tea about 4 or 5 times a day can also be helpful. There are a few supplements that I have seen to be very helpful. Milk thistle, n-acetyl Cysteine, and alpha lipoic acid can be of tremendous help in boosting the liver. frequent and copious amounts of C are needed.
Juicing is important. Again, avoid sweet juices. The best is broccoli sprout, alfalfa sprout, wheat grass, all juiced. One or two carrots a day may be included. Use whole washed carrots to juice. Do not peel as 90 percent of the healing power is in the skin. Avoid starches such as rice, potatoes, wheat, etc.
3) Once recovery has started, then work on the cancer.
The fastest way to reduce cancer is to starve it! NO SUGARS! NO SUGARS! Lots of Oxygen, alkalize, exercise. The hungrier that your body gets, the more that it will turn on the cancer.
4) Spirit
Most people with cancer have some form of emotional issue eating at them. Something is wrong in their life, it may even be something that is completely out of their control.
The absolute fastest and most powerful generator of miracles is prayer. God does not always grant the prayer's wishes but when he does, you will certainly know.
I do not like saying this part, but it is best to keep any toxic or stress causing family members or friends away.
There is so much more that can be said but for now, I will end this by sending my prayers.