This might seem a little chilly, but it's helped me in situations similar to this…
I know how difficult it can be to feel obligated to say 'something' to someone who is terminally ill, but have you considered the fact that hearing words of comfort from you, specifically, is very likely MUCH less of an issue for her than you think it is? I didn't see any mention of friends and family, but I'm sure she's got them, and I'm sure they're all there for her. Facing mortality is heavy, and I'm sure she's got a lot going on in her head, but I doubt she spends as much time wondering why she hasn't heard any comforting words from you as you do worrying about how you can approach her and what you can say. She's got her loved ones to say goodbye to, maybe even some unfinished emotional business or similar matters, and whatever else that would be a matter of concern when approaching the end of one's life. I'm pretty sure she doesn't spend the bulk of her time wondering when you will approach her.
I would think the mindset of someone who is terminal would be……well actually I wouldn't know what to think because I have never been there. But if
you were dying, would you be overly concerned about hearing from each and every person you work with? I don't know, maybe you've been at that job a while and are very close with everyone…still, she might understand your discomfort with the situation better than you think you do. Additionally, you might not be tho only one who is having difficulty approaching her.
Hope that didn't sound callous.
Hepzibah Pynchon wrote:Don't be like me. I watch the obits for deaths of anybody who bullied me in the past. That way I can go dance on their graves.
Now THAT's callous.

Love it!!!