I think there's a lot of misunderstanding here.
A key thing to appreciate is that the women in this article, including Rebecca, are not spies. They are civil servants [1] working in a very sensitive area of government. None of them are undercover, or sneaking into Russian bases. It's a sensible precaution for them to keep quiet about what they do, but it's not like their ability to do their job depends on absolute secrecy.
By way of comparison, the US equivalent of Rebecca, who is the deputy to the chief of the service, would be the deputy director of the CIA. The identity of that person is not only public, he has a wikipedia page [2]!
[1] Well, diplomatic servants, but that's basically an alternative flavour of civil servant that exists for historical reasons