Sister diagnosed with lung Cancer & secondary, rib, shoulder. She lives in another country and I'm going to visit her soon. What can I do to support her?

My sister lives in another country & has been diagnosed last year with Lung cancer. After Chemo & radiation she was told it had cleared. 3 months later it is back and has spread. She started another round of chemo reluctantly yesterday. She was told that if she decided to not have chemo she has a couple of months to live. I am travelling out in a couple of weeks to give her company and help in any way. I am dreading it, I feel sick when I think of going... I needd to get over it. She has little energy & in a lot of pain. Does anyone have any advise on what i can do to make her life better, happier, more comfortable. What food is can make her?

Thank you for any advise.

Best wishes to everyone during this awful journey