Can’t imagine the end w/my Sister

I’ve spent the last 5 months reading,and learning all I can on this horrific cancer. There is still so much I don’t understand. My sister was told in june she had cancer in the bile ducts. Since then she’s delt with plastic (I think) stent changes 8 times, She can not eat at all, so she has this big bag attacted to her, for food & nutrients. She’s had numerous infections, hospital stays. In August it started moving to the liver. Chemo was done for 8 weeks and almost did kill her. Durning chemo, the cancer in the ducts got larger and now its through the entire liver. Her Dr just said that was very uncomon, and she must have a very agressive form of cancer. Tomarro a metal stent is being put in. They told her she may have 1-3 yrs. She is as of last week 46 years old. She has taken all this in stride and with a calmness I was not born with. The only time she really crys is when talking about her kids. 8,11 and 18. The 18 year old lives on her own. Plans are being started for the younger ones to become closer with my family I have a 11 yr old and 13 year old. I just do not see how she is taking this all so calmly. I would be kicking and screaming if cancer was taking me away from my husband and children. I have cryed more in the last 5 months than I have in my entire life. I do everything I can to not cry around my sister, but my husband said I need to try to vocalize my love and feelings to her, so I don’t live with regrets later for not saying them. I’ve been working on it. She knows how much I love her kids, I’m all 3’s godmother, My husband is godfather to 1. We have made it clear we’ll be as loving to them as our own. She’s planning on me holding on to some items she wants to be buried with. She did get teary eyed about that. I don’t want to make her cry, I want to make her smile,and laugh and enjoy things with her kids. But its so hard. This last week she has swelled up like a marshmello, her whole body. Fluid they say, but diuretics are hard on the kidneys so they will not give her much. She’s been a diabetic for 37 yrs. I would welcome any info on this swelling, what the end maybe like and dealing with my own emotions, hers and her children. Is this likely to go next to the lungs?