Self aware

So we're in Harrogate, walking along Cambridge Street, heading for M&S (cos we've already been to Lakeland) when Jan disappears.
How does she do that?
I didn't immediately notice that she'd gone but when I finally realised that I was talking to myself, I followed her in.
"This is nice," she said, whilst fondling what I have to admit was rather a nice jumper. Her radar must have been working overtime. How the hell did she see it, hidden well inside the store, whilst walking past the front door? Amazing.
Anyway, she decides she's going to buy one but finds that all the sizes are way too small.
"What the hell did you expect?" I said, "this is Miss Bloody Selfridge, "when was the last time you were known as Miss?"
Not to be outdone she said, "Well, there are loads of fat girls around, they might have had my size."
I had to laugh.