Something we did for good friend was to decorate a jar, and call it a Memory Jar, or you could find a happier name, like a Good Times jar. Everyone who came to visit would write down one of their favorite memories of that person, or maybe just recitation of how you feel about her as a friend. My friend would occasionally have a friend or family member pull some of the slips of paper out of the jar and read them to her. Also, when my mom was dying, she loved to have me read from the numerous cards and letters she received, many of them talking about good times, or how much she meant to them. This may be hard to approach with someone who is still fighting to live and has not accepted the fact that they are dying, but once they get to that point, I think most people would find it comforting to know how they are going to be missed, or that they made an impression upon the world.
You could also try to organize some of her friends or co-workers to spend time with her in shifts to give her family a break. We never left my mom alone in the hospital, and it was surprising how many friends, some not particulary close, who were happy to committ to spending a few hours. Even if she is unconscious most of the time, at least the family knows that someone is there with her to make sure she is comfortable, or just to let them know if she wakes and needs something. But definitely speak to her family first about it beforehand.
