A dying sister is real

I asked my acupuncturist today if she could help me to stop questioning if my situation is real. A dying sister is real. Why do I have to keep asking myself this? I keep rolling it over and over in my mind. How could someone who is here and present, be fading so quickly?
My sister for 61 years.
I don't understand the suffering she has to endure. Does it have meaning? I hope her reward is great.
The other day she asked me, "Did you see that trash can?" I said, "How about changing from seeing trash cans to seeing something pretty? How about something like your beautiful paintings, the reds and golds and turquoise? Your beautiful flowers, some blue sky, big puffy white clouds. See any angels? Any castles?" I said castles because our mother saw a big castle not too long before she passed into a coma. I wanted my sister to see beauty the other day. At one point she covered her head and said, "too many flubers...or some such word. " I hated that she was frightened. I wanted to talk her into seeing something pretty. She did nod and say yes to her paintings and beautiful colors.