My mommy is dying

My mother just turned 50 and has struggled with colorectal cancer for the past year. Her cancer has finally metastasized to her lymph nodes, kidneys, uterus and intestines and is inoperable because she is too weak to undergo surgery. she is not responding to chemo anymore. I live in rhode island and my mama is in Colombo Sri Lanka 8700 miles away. I am flying this saturday to be with her while she's still able to talk and walk and stuff. I'm have to watch her die and I'm so terrified. I'm so close to her, for the past 4 years I have been envisioning my life when she finally joins me and my husband in the US but now thats all gone. I have no idea what to do and how to face what's coming. My husband is not able to come with me because we don't have that much money. We are both grad students so we are pretty much broke. I dont know what to do... how do I face this changed reality and the fact that my mama will be gone. She has always been there for me and now I want to be there for her. But I feel helpless and angry and confused all at once.