She's popular for being bad. Check out this link:
Read at least a quarter of the comments and you'll know what I mean. I love how everyone jumped to the blogger's defense.
As a writer, I used to be terrified of all the rejections I'm sure to get when I finally try to publish my work, but I'm not anymore. This has taught me that rejections are good. Self-publishing authors don't get the experience that comes with a rejection, so I guess they're more likely to respond like Miss Howett -- childishly.
This is also why it's important to find as many different critics as possible while you're still in the writing phase, and make sure at least a few of them are blatantly honest about their thoughts. Don't give your work to your mom or your best friend who never reads. Find someone who knows what they're doing and isn't afraid to do. Find a lot of those someones.
But at least Miss Howett's given us some form of entertainment (and certainly got the blog more attention)! Maybe this fiasco will teach her a thing or two about professionalism and manners.