If you don't want to alter "perfect" conception, why not go back to living in caves and speaking in grunts? That argument is incredible.
But, see, she doesn't believe that either...
No mention of speaking in grunts and cave living fits her perception of history... Think more along the lines of ancient egypt as "the beginning" or nearly so. "Man" may have been around earlier than that, but the whole "pre-history" and "primitive man" idea doesn't really fit her perception of how things "began".