Just look at how she teased Anakin, it seemed quite deliberate to me. She was leading him along the path to the dark side from the very beginning.
"Oh, Ani, we can't fall in love!" she says wearing a revealing dominatrix outfit next to a romantic roaring fireplace...
1. Lucas intended her to tease Anakin.
2. Lucas knows women, and that some women are truly that clueless.
3. Lucas has absolutely no clue about women.
Gotta say my money's on 3.
1. Lucas intended her to tease Anakin because she was part of the scheme to turn him to the dark side.
Anakin came from a 'virgin birth'. Everyone LOL's. Sounds funny, right?
But then later on we learn that Darth Sidious' teacher, Darth Plagueis, had the ability to use the force to actually create life...
“Darth Plagueis was a Dark Lord of the Sith so powerful and so wise, he could use the Force to influence the midi-chlorians to create life."
Anakin had the highest midi-chlorian count ever recorded.
So this Anakin who came from a 'virgin birth', does that really sound so implausible now? He was created by Plagueis; Anakin was effectively an artificial person, engineered by the force to be a super-Sith. Plagueis probably intended him to become his own apprentice and use him to rule the galaxy. Sidious learned of this plan, killed Plagueis and took over the operation.
Padme was a crucial part of this plan. She was from Naboo, where Sidious is also from. Given this and the way she treated Anakin and how well it played into Sidious' schemes it seems implausible that Sidious and Padme weren't working together.