Several days later and I since confirmed my initial thoughts. I did come home that night at told W that I would say something to D15.

Next morning I apologized if it seemed that I was rude to her friend. She blew it off. It didn't seem like a big deal.

Seems W who had just come home from retrieving D19 from college had taken and exaggerated the incident in order to project at me. Who knows what the real reason was?
Perhaps she was tired from the drive. I don't think she resented handling the retrieval herself.

Anyway, a day later and W seems back to nornalish. I've not really been concerned as I have been focused on other things.

M 53 W 54, M since 98
D15, D19
8/2013 discovered EA, W maintained contact with OM
until 10/14
7/2/17 W said she wanted S, 7/25/17 moved out of MBR
12/17 W says moving out 5/18, W still in home.