First, get yourself a google alert so you can know when your name is mentioned or your work, you get an email saying so, it cuts back on the random element of discovery.
Second, report the editor and her letter and the page and its contents to Preditors and Editors and Writers Beware, two watchdog sites that warn writers of unethical practices in publishing.
Third, go back to the website and look up the submission guidelines for actual written work submitted, so you can have that written work as a primer for what 1) you should have been compensated and 2) explain that you did not submit ergo, you are not under any obligation to pay anyone for work unsought and that editors DO NOT get paid by the contributors for editing, writers DO get paid for writing and editors are paid by their publication FOR editing, ergo, she has some nerve trying to shake down you for violating copy rights. That being said, if you put it on a blog, it's published. If you put it on a website, it's published. Once it is in the public domain, it is like second hand clothing, you might get paid by someone for a reprint, you might not.
--Sherry from Erma Writing group, wouldn't let me use my twitter account.