I think the note to your W was appropriate. You expressed appreciation for her kindness without laying it on too thick. Hard for her to get overly upset with that, isn't it. And maybe she'll remember it the next time she starts into a "Nit never appreciated anything I did..." spew; but maybe she won't because there's a hole in that bucket.
So you handled the whole event well. See? No pressure, no drama. Now leave it alone. No follow ups. No expectations. The whole point was to establish that the two of you could be at the same place at the same time without it being unpleasant, and even that was mainly for you. That's all it was, nothing more, and you succeeded.
