Forgot I'd subscribed to an Amazon review's thread. Received a reply alert. I reported it to Amazon as "an ad hominem attack on an Amazon customer reviewer", and when I clicked send I then saw that Amazon had deleted the comment (scroll down to the end: "Deleted by Amazon 1 hour ago").
Trying to find out what her new Big Five book was, I didn't find any under her Initial.Surname name with which she'd self-pubbed two books. However, her profile linked to her personal Facebook, where she complained about the same reviewer here and here.
Turns out that, unsurprisingly, she's a Trmp fan: here and here.