I don't see a lot of links between bbit and BitJane except the article that was published, but who knows...
The real question is who is "Sahra Hall" the mystery other admin that is living in Australia, probably in Sydney, that is a Bitcoiner that attended Bitcoin conferences (conversation on the Hashie chat with Andreas Antonopoulos), and that is probably the one that made the cryptochallenge/ARG, and so like cryptography.
She is probably the "Queen Elsa" too I think.
She is obviously far more caring about her OPSEC than Matt and there is nothing at all on her apart from the details she gave on the chat.
I think Andreea Popa is probably Matt girlfriend or at least a Matt friend, perhaps she even gave advices to Matt on his projects, but she seems to have a regular job in marketing in an investment fund.
She is not really fitting in the picture but perhaps she helped to the administration...