I wondered this as well. My guess was the weird painting/art thing hanging up, I don't know if it was there before the convo though. I thought it would have been a picture of their dive or something.
In my playtrough she must have used a time machine, because that stuff was there at the start of Act 2A cardboard box with a diving suit. It should be next to the door iirc.
On the other hand, a Lizzy Wizzy poster and a political ad from that one dude are both by the door.