And for the record unless I'm missing something, I don't see how this is a big deal. The dentist is not in her state and she has no authority over this business, and any restriction on her making any such endorsements at all seems like it would run afoul of McDonnell v. United States (yep that involves former Virginia Governor Bob McDonnell and why his conviction was unanimously annulled.)
This is a rather weird thing for a sitting Governor to be doing, but unless there's some notable bit I'm missing I'm not seeing how it could be a crime.
FTC regulations that apply nationwide, in addition to numerous consumer protection regulations under various state & DC laws, have made it extremely clear that influencers need to disclose when posts on their social media are sponsored content. Nobody is claiming that a crime occurred here; her actions, at worst, carry civil implications. There'll ultimately be no problem if she was genuinely just a happy customer, but it's really sus that she's refusing to confirm or deny on-the-record the simple matter of whether or not she was paid or her services discounted in exchange for her ad appearance, & made all the more sus when the doctor's office in question responds with attempts to argue with a straight face that they can't confirm her payment/discount/customer status because that'd be a HIPAA violation.
OK that makes more sense.
Although that's still fairly minor so it's tough to see why a guy facing 88 felony counts would care.