In S2, Seven of Nine wakes up in Bizarro World thanks to Q changing the past and shielding Picard and friends from the changing timeline. She got to spend 7 1/2 episodes Borg-tech free.
After being fatally stabbed, the Borg Queen saves her via assimilation. Now, she could have just used her Borg tech to just heal the stab wound. She could have just randomly partially assimilated Seven. How did the Borg Queen know to partially assimilated Seven to exactly how she was in the prime timeline? 

