Glad you're enjoying it. Which scene was that? I'm looking at the script and non of her scenes should trigger unless you're on her route.
It's a scene where you go to her house and then to the gym there and she's wearing white lingerie, I also realized it might be because I got her phone number (which I assume started me on her path) then later I just didn't do any of the other things with her (ie. didn't take her out on a date when prompted), but it was very confusing because she talked about a previous encounter in I believe a storage room, which I assume if I had fully pursued her I would've seen that scene.