As I've expressed before I'm rather unfazed by the journey, but as I move forward with the process I become acutely aware of the pain of my loved ones. So, famita, I empathize with you. Perhaps your sister could make some videos that she can leave as keepsakes. You can create a YouTube account for her where she can upload the videos where her family can view them remotely. That may help to ease her pain.
When he was dying that has helped me to externalize my feelings. Perhaps it may help you and your sister. Fair warning, don't listen to this song without a box of tissues. (close your eyes and listen without reading the lyrics first)