Why no potatoes on neighbor's plants?

My neighbor has no computer or internet access, so asked me to poll you folks: Last year, she put in a garden for the first time here. Lives about a mile from me, so basically the same soil type. I got potatoes, she didn't. Planted the same type, but she fertilized every week with Miracle Grow. Got lovely plants, but not one potato on any of them. Was it the Miracle Grow? My plants get eaten by midsummer by grasshoppers, until there was nothing left but stems, but I left them and they still produced potatoes. Not a huge harvest, but not bad. I can't imagine what else it could be, but told her I would ask. Thanks! Jan

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