I don't believe any of the Queen's overtures, thinking she would have said anything to convince Seven to voluntarily return to the fold. All the business about Seven being special, unique, etc., were false promises. It does however, open the question of why Seven wasn't re-assimilated by force.
As for the quest for perfection, a later episode (after letters from Earth are received from one of Seven's Hansen relatives) suggests she was a perfectionist even as a child. She always used to pick out the best strawberries or something, whereas Seven had assumed that quest for perfection was due to her Borg indoctrination.
Still watching Dark Frontier, went to sleep after the post, and just restarted Part 1 again.