It's not a stupid question, Sarah. I am the same way. Some people understand exactly how to get the max out of a computer and others, like me, struggle with it. I think the younger generation are brought up with computers and find using it second nature.
As far as Dorothy knowing exactly where to look for something and finding it in "warp speed" timing, I don't know, perhaps she has a 6th sense or something.
Do you suppose she will give away any of her secrets?
Oh Dorothy!!!!!!!