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Maybe this is just my fault as a visual thinker, but these two statements seem contradictory to me. How would she have counted in her head without mentally visualizing the cars?

I can't visualise the cars, doing so would likely "overflow my buffer" and loose the question... I think in words not pictures, I "self talk" through the problem (in whatever method I am currently up to using).

I remember my great excitement talking about a visual spatial style spelling technique to a friend, and I how I thought it would help my daughter. She and her husband both responded "Well how would that help, everyone can do that!" Er no. I couldn't do it, it would have been of no use to me what so ever. It was on the other hand of great help to my DD...