sorry to hear about your mom.
At times like these, it is best to avoid chemotherapy if the patient is not willing. There are many other therapies available for her which are effective and also not so troublesome. I personally see a lot of cancer patients and my mode of treatment is integrated therapy where we use Homoeopathy and Mistle-toe therapy.
If you are interested in considering these therapies, please reach out to me. To get an idea about the cost, you can see my package for cancer treatment on my profile on Lybrate. I can definitely suggest to you that these therapies will have practically no side effects and will help your mother to lead a good life.
How much of the disease can be treated will depend on what stage it is on. For this I will require to see all her reports. However, we can at least make sure to give her a good quality of life without suffering from side effects of treatment and also try to control the disease if possible.