But why would the Queen whisper in Jean Luc's ear as to where the attacking cube's weak spot was?
1) To allow Picard to destroy the Cube and thus be lured into the past, where he was needed to kickstart Cochrane's stalled warp program and found the Federation? An antagonist who can travel in time at will when you cannot will inevitably triumph over you, so what we witnessed must have been a Borg victory, down to every detail.
2) Maybe she didn't, and Picard got that out of the complex feed whose actual purpose was different.
I think the whispering voices that Picard kept hearing were from Borg equipment that Crusher couldn't remove
Since Crusher originally insisted she got everything out, the equipment might well have been recently assembled by the nanites Crusher didn't get out because she didn't even know they were there.
That, or then the macroscopic equipment was stealthy enough to confuse Crusher. But nanites being stealthy is a bit easier to accept...
Timo Saloniemi