If JK Rowling Cares About Writing, She Should Stop Doing It

I can't help thinking Ms. Shepherd should've listened to her friend. So, she starts from the erroneous premise that publishing is a zero-sum game, singles out a female author mean girl style, hits on some literary anti-YA snobbery... is she playing troll bingo?

(Also, apologies if this was posted before and I missed it, as it was published Friday.)