Depending on what she has wrong with her, please don't be surprised if she doesn't like to be touched. My dad's skin was very sensitive at the end and I couldn't even hold his hand as he pulled it away because it hurt him.
Also, don't be afraid to cry. It is not weak and a tear or two between you will be a sign of how close you are. Take her lead. My last words to my dad was about a joke he told over and over again so he was still glinting in his eyes, very special.
I also had a good friend die this year too, and the last time I saw him I didn't know it would be the last, even though we knew he was dying. (I thought I would visit one last time but it didn't happen as he was too ill then). We sat out in the garden, he was telling jokes, as he had done all the time I knew him, and then he went off for a lie down. On going he waved and said "see you" , "yes, I said, see you later" and they were my last words to him. I did say my piece to him while in the garden though, that he was one of the best and he had been a great friend to me and my children. (He dressed up as Father Christmas when my son was little and scared him on Christmas Eve as my son told him that he hadn't wrapped his sister's present up yet!) He was a true gent, but I hope he knew that all the time we were friends, not just at the end of his life.
This year has been an annus horribilis (although that wasn't my first description of it!).
for you. X