The author seems to be making a postulation and not a presumption. I suggerst you take the time to read.
Beasts do not have recursive thought while humans do. There came a time when recursive thought emerged, the fruit of the tree of the knowledge of good and evil, if you would. With our ability to examine genomes, when this happened may well be an interesting pursuit of knowledge.
Presumably, she spent time as a reflective agent while Adam lived in Edenic ignorance. In this post,
Presumably means to presume, that is make a presumption.
Can YOU read?