I gave this question a lot of thought and here is my conclusion:

Obviously it would depend on how many pennies and how much copper wire and which one was worth more. That's what she would go for first. She would be able to instantly count the pennies and estimate the price of the copper wire at a glance. Since I am only a jew, I would only be able to count the pennies while they are still in the air, like Dustin Hoffman's character in Rain Man (he can do that in reality because he is also a jew).