Just to update this, I've now passed the same girl 3 times. She's dressed for the profession, if not the weather. The odd thing is she's on patrol quite early in the morning - about 9.15 - and I'm halfway through my regular dog walking morning. I don't go out of my way to pass her, she's there on a corner that I cross on my regular route.
Yesterday she smiled and said " good morning". Even if I wanted to ( which I don't) I've got an excitable spaniel on a lead with me.