Few ideas for your mother, things I would suggest to my mother if she would be in the same situation:
- Dr Johanna Budwig Diet: Flaxseed oil + cottage cheese, there is a forum on curezone dedicated to Flaxseed oil
- juicing fresh vegetables, juice fasting
- liver flush, always good for liver detox
- Rotation-Elimination Diet
- enema or colonics
- of course, her diet should be 100% free from industrially processed foods, 100% home made
- fermented foods like home made yogurt, fermented vegetable
- FMT , there is some indication that many cancers are related to gut dysbiosis, especially cancers of the GI tract