Maybe she had a bad experience on a coaster (it doesn't seem possible to me, but you never know...) One of my cousins, for example, went on Mind Eraser at SFDL and she absolutely loved it. Then, she went on the Predator, not exactly the smoothest coaster in the world. She happened to sit in the second row of the first car, the bumpiest place on the whole train. It took a looooooong time for me to convince her to get back on another coaster.
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