At the time I asked the question about who added the tag – I didn’t realize there was a way to follow tags and find out who left it. Apparently, the malicious tagger wasn’t aware of this either.
Another writer at the KDP was more savvy than me and my nemesis, and quickly uncovered the culprit. Back then, he was using Batarang Wally for that account, not Loraine.
He’d also been pretty active – leaving malicious and nasty tags on other books by authors who frequented the forum. One such tag was left on Marti Talbott’s book Marblestone Manson. Marti was a frequent poster at KDP. He tagged her book: author that misuses adverbs, abortion. I happen to have read that book, and there was not an abortion in it. Marti prides herself in writing clean historical romances. The tag was obviously left with malicious intent – as were other tags, left on other books by authors who frequented the KDP forum.
So how did we figure out the author behind the Batarang Wally user name? I’ll tell you tomorrow.