She isn't. She does not respect the basic principle of privacy of information. It does not matter if the client or a patient is an asshole - his private information is SACROSANCT.
It also does not matter if she posted private info online for the revenge or out of stupidity or out of need for attention - she is able to violate the privacy - she will be a liability for any medical entity, because the HIPAA law is extremely strict.
Everything else is irrelevant, but she did an extreme disservice for herself and future employment.
Vox, I think that part of it is fair enough. Whatever else did or didn't happen, her judgement in posting a photo of the receipt on Facebook (or any other public form) was pretty poor. It's uncontroverted she did that, and her employer has disciplined her accordingly. That said,
she IS a nineteen year-old student, not a fully trained and licensed nurse, and I do not know that she has received appropriate training in the ethics of that profession as of yet (if she has, that would put a different spin on it). Given that, and the obvious lack of critical thinking/decision making skills among so many of our young people, I don't know that we can say her character is quite beyond redemption, based on what we now know; if there was further dishonesty, that would put a different light on it. I don't think this is a particularly good recommendation, but in and of itself, I don't know that it ought to be a career-killer, either. I get what you're saying, and there is an issue of respecting confidentiality here, but we also have to have some regard for context.