Khakis of course. 
Okay, I finally figured it out.
Remember that the cousin's big into fantasy games.
So she dons a uniform, slips in her sidearms, and has a map laid out flat on the dining-room table, using golf tees (upside down) to mark places where the scanner alleges there's fires.
And then she
imagines she's calling the various fire stations, to assign them which fires to fight.
That's all it is, a little fantasy game, and solo too.