What is important is that even she knew what is good and what is bad
I know what you are trying to say. I was simply emphasizing the fact that socially acceptable application of the universal truth is more important than its possession.
Babies as small as six months old can discern the difference between a good nurse and bad one. Same applies to animals too, wherein, a dog knows whom to bite, whom to bark and before whom to wag its tail.
This ability can be called as discernment or an unlearned ability wherein, conscious beings learn good and bad due to an inbuilt instinct to survive. Individually, each person has a choice to do good or bad, however, socially, the law of the land decides what is good and acceptable, and what is bad and not acceptable, and hence there is a set of laws that decides what is good and bad, and this usually trumps individuals choice.
Whether we need God's guidance is left to an individual's choice. But socially, each person is bound by the secular law which validates what is good and what is bad.