Which One is D?

8-yr-old girl.  Not the most organised child...  Didn't have any time on the holidays to do any practice.  Obviously forgot a few essentials.

Me: Just to check you haven't forgotten too much... [she giggles guiltily] Let's have the D major scale.  [blank look] It's the do re mi- you know, goes up then down one step at a time.  Violin on shoulder.
Girl [sets up her posture relatively nicely]: Ummm - where does it start?
Me: The D major scale is going to start on D.  Do you remember where D is?
Girl [looking awkward]: ummm...
Me [loud whisper]: It's the string second from the left.
Girl [looks awkward]: ummm... which one is the left...?
Me: Oh dear.  Start on this string.

Once she got going, she was fine.  Thank goodness.