Dave-- Even her willingness to continue contact with you can be seen as a plus, even if huffy. Was it ever a problem for her before, saying that you didn't notice how she feels? Maybe you can take her a small gesture (or have one of the kids bring it to her), like a cup of coffee the way she likes it, say "You looked a bit down..." smile quietly and walk away.
Either way, wanted to let you know that I was thinking of you...
