Thanks so much for your responses, guys! Makes me feel better!
I guess this woman's comments hurt because there's a kernel of truth in them. She's found the issues I'm already paranoid about and attacked! I wish I kept a perfectly clean, neat house worthy of a magazine spread, but it's just not in my DNA!
Oh yeah, and the reason I think it's a woman is because the name she posted under is a woman's name, and her e-mail address sounds feminine too. But it's true - you never know on the Internet - it could be a dude!
I looked up how to block her IP address, but I don't have the latest version of WordPress, and it's not an option in the old version (or I can't find it if there is). So I need to update first or keep searching. In the mean time, if she comments again, I'll just delete it.