What does she care? She has made a fortune off her work — and no one has issued a fatwa.
She would be wise to shut her piehole and just keep doing what's making her money.
My sister-in-law, niece and nephew are so fundmentalist they want us to boycott the new dollar coin because it is missing "In God We Trust" (actually, it is on the edge of the coin), yet they are in line to buy every Harry Potter book, each getting their own personal copy. There are millions like them. Rowling would do well not to insult a big part of her customer base.