Obviously it would be unethical for her to add or alter anything for a specific motive but I can't see how anyone could do anything to control that fact. She will or she won't.

just a heads up...if you were here where I live and work emails are not admissible because they can be faked and are not covered by confidentiality/ethics laws. short version anyone can create an email and pretend to be anyone. hackers and scammers do it all the time by hacking into companies and then sending bogus emails. just today my spam and inbox in my email is full of emails from bogus mental and physical health and other companies that I know did not come from my bank, my treatment providers and other companies\websites ...all your ex treatment provider has to say is someone must have hacked into her email account and those emails are no longer proof of breach of ethics. (this is why here at the crisis center where I work we do not email clients and my own treatment provider does not use emailing of clients.)