Yup, she sure has.
http://tinyurl.com/5o3ru7
What's particularly galling about this is that the fan fiction in this case was an encyclopedia based on the Harry Potter series, a reference guide which amounts to commentary on a piece of fiction. Rawlings complained mainly that it would interfere with her own planned encyclopedia. In other words, a book she hadn't even written yet. (The fan's mistake apparently was to take wholesale quotes from the book.)
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