Erica,
Not all her feedbacks are negative. In fact, the majority are positive, but "with a twist". She would say something like "nice XXXX, but it came with YYY ZZZ, which kind of spoiled the experience". Maybe she just was extremely unlucky, or she is one of those people who are impossible to please, or she believes it is her role to prevent the seller from being spoiled by too much praise ;-)
jenni,
Her complains are about the kind of items different from what I sell, so I don't know what she may complain about in my case.
Thank you for citing Etsy rules, if push comes to shove, I may use this escape route.