Grandma's having trouble

Hi, my name is Paige. My grandmother was diagnosed with breast cancer in March, a week before my eighteenth birthday. She has Stage II, but luckily they caught it before it spread to any organs. They decided to do chemo and radiation every two weeks. Since then, she's been unable to eat or drink much (which is especially bad since we live in Arizona, where it is dry and hot). She'd feel "okay" about three days during those two weeks. She missed my last band concert of my high school career, which was the first one she's ever missed (she even used to come to our marching practices on Tuesday nights), as well as my high school graduation. A few weeks ago, she was admitted into the hospital because of dehydration. Her doctor decided to give her chemo and radiation every three weeks instead of two.

But she's still feeling terrible and not eating. The mere smell of foods and certain candles make her feel nauseous. For some reason, she and my grandfather refuse to make appointments for her to go in and get an IV every day, even though my father says she needs to unless she drinks more. He told her tonight that she has to keep trying to eat, especially on the days she doesn't feel as sick. Just talking about her not feeling sick made her feel sick... enough to get off the phone. My dad said that in that particular instance, her nausea was just mental. I don't know whether he was right or just being insensitive. Either way, I'm still worried about her. Nothing seems to help.