its not about copyright, its about ethics.
Even if she doesn't pass through here, someone she knows might and
inform her.
You just gave her all the reasons not to talk to you, and to trust
her 'brother' even more. True, she means nothing to you now, but
word of this might just get around and hang in the air for time to
come. What comes around, goes around. You don't have to remove that
conversation, but at least edit it such that names aren't mentioned
or add a disclaimer yah?