I mean, no, obviously the Borg play a major part here but I'm wondering if this mystery girl who seems to know Picard without knowing him and is very important etc etc isn't just an ex drone. I'm wondering if maybe she has Romulan Katra's from the destruction of Romulus (or from Picard's evacuation of it/evacuation of Borg attacked Romulan space). We know Spock and other Vulcans were working towards reunification so it's not impossible that some Romulans rediscovered unused telepathic abilities - including Katra's. Maybe that's why "she will be the end of us". The Katra's contain knowledge the current Romulan rulers DO NOT want revealed.... Anyway, just a thought.