My mom just passed from Cancer and I know that if they don't want to do any more for themselves you can't make them. I was told that they know that the more they do the more the body feeds the cancer and they just want to give up.
My mom was in alot of pain on 380mg of morphine a day and statex for breakthrough and took up to 16 extra pills a day. At the end when she stopped taking her pills she finally had to give in and get a butterfly hooked up, it worked great for her.
God love you, If you need to talk to someone I am here, this is an awful thing. And to me unless you've been through it people really don't understand.
Take care of yourself.