She didn't know about the specific date. My guess is that she picked up on a vibe from me, and I've been sure to create some mystery about my whereabouts/activities, especially on Fri/Sats.
I agree that dating more may actually have a positive effect on the sitch.
At the exchange tonight, W initially played up being on the phone with someone, laughing uncontrollably. We waited briefly, I smiled, handed S6 over, and talked to her in a brief mild, yet friendly convo.