Welcome to OCF. Im sorry to hear about what your mother is going thru.

As far as her feedings go, she needs to have a higher caloric intake than a person who is well. Her body burns up calories very quickly fighting whatever is going on. In the US, there are many over the counter formulas that can be used if prescription formula isnt available. Here in the US we have hundreds of different feeding formulas the doctor can prescribe that a medical supply company will bring monthly. Check with her doctor about prescribing a feeding formula for your mother. She needs at least 2500 calories and 48 oz of water every single day.

I laos wondered if her sores had been biopsied. Is the chemo Erbitux? This will cause rashes and blisters. Chemo is used alone for pallitive care. By itself it will not cure the cancer. I would suggest speaking with her physician about her long term care and then seeking out another specialist. I would say go to the largest cancer facility where they will have the most experience in treating oral cancer.

Best wishes!