There is no proof that Eve heard directly from God, only that the Snake said "Did not God..." Assuming she did know, she could have been told that by Adam and not directly from God himself. Your basing on what you want to believe and not exploring the possibilities of other options.
Highest IQ in history? Where in the heck did you come up with that? That sounds totally lame. If his IQ was so high, then he would have built a John Deere tractor and plowed his fields. He was God's gardener for crying out loud.