Marcus: For most ethical dilemmas the journalist is likely to face, traditional journalistic ethics is clear, adequate, and essentially correct.
Conclusion (supplied by question stem)
Traditional journalistic ethics is NOT clear, adequate, and correct for most ethical dilemmas journalists face.
Evidence
In the typical case there’s uncertainty whether some information is newsworthy in the first place, so the general journalistic rule that is inadequate.
Evaluate
There's an important New Concept in the Conclusion: most ethical dilemmas.
Anita seems to supply an example of a situation in which traditional ethics does not provide clear, adequate, correct guidance.
But is this sort of situation characteristic of "most ethical dilemmas" that journalists are likely to face? Maybe the ethical dilemmas they're likely to face have nothing to do with this sort of situation.
Furthermore, even if the ethical rule Marcus cited about "going to the press immediately with newsworthy info" wouldn't apply to this situation, maybe some other aspect of traditional journalistic ethics would tell journalists what to do in such a situation.
Goal
Let's look for an answer ruling out the idea that some other part of journalistic ethics would give clear/correct advice in the situation Anita describes, or saying that the situation Anita describes isn't what most ethical dilemmas are like.