So she is "super-disgruntled". If anything that makes fighting with her even more foolish. Most of these sites (certainly yelp and google) allow service providers to respond to reviews. Leave a single note, "We're sorry this patient wasn't satisfied with our service, and have refunded all fees. Since most of our patients are happy, we rarely need to do this." [0] Actually even that note is too confrontational, but maybe there has to be a sort of compromise between one's emotions and one's business. There's no way a patient with a complaint about fees gets a lawyer on contingency or a guest column in the paper if she already has been offered a refund. This is different than a malpractice injury case, which would need to be handled more carefully. (Although even in those cases, getting the patient to
accept a refund is golden.) Still, the attorney from your malpractice insurer would also advise against this scorched-earth bullshit. This physician must be on a bare-bones malpractice plan, that his dipshit attorney hasn't already been banished by competent legal representation.
[0] if the provider has to issue such refunds all the time, there are other problems to address...