she's may not be smiling right now, thats asking alot of her, but when she looks back on this time she will remember that you were there for her. whether you said anything or not, she will know that you were by her side through this. the smile comes in the future when she looks back and realizes that you were there for her.
just be there and hold her hand. theres nothing you need to say, just be a warm body for her to hold onto.
im sure you realize all this, i'll be thinking about you guys.