I would look into using BioSuperFood that is basically an all natural supplement derived from five different algae all grown and harvested in the deep cold waters of sea near Siberia. It is something you might want to look into. A Russian doctor developed it due to his family all dying of pancreatic cancer. I think you might find it very helpful for you mother.
You might consider also using Moringa that also gives a full balance of nutrients, the important point is - balanced.
There are many things you can do for her. At her late stage you might want to consider, if she is open, to looking into hyperthermia or even the BX Antitoxin that could give her hope to resolve the cancer. Google jesichashope if you want to read some data on these options.