Actually, the account says, “ The woman saw that the tree was good for food and pleasing to the eyes, and the tree was desirable for gaining wisdom. So she took some of its fruit and ate it; and she also gave some to her husband, who was with her, and he ate it. ” (Gen. 3:6) She claims later that the snake tricked her, just as her husband tried to blame his choice to eat the fruit on her. They refused to take responsibility for their choice, they didn’t repent, but that doesn’t mean they didn’t make a deliberate choice with full knowledge of what they were doing.
Given a choice between what God told them and what seemed pleasing to them, they did what pleased them. There wasn’t what you’d call a hard sell coming from the snake–he only gave one reply to the premise that death would follow if they ate the forbidden fruit. They were given the possibility that they would be better off with their own decision-making than God’s, and they decided against God’s decision-making in favor of their own.