The author points out indirectly that it is really more of a guess than a theory.
Read it again, she explicitly states that it is not a guess and provides the scientific definition of "theory". Genetics has verified Darwin's original hypothesis as has numerous laboratory and field studies. It is a fully formed and robust scientific theory.
> The author points out indirectly that it is really more of a guess than a theory.
Really? Where? She says quite the opposite and takes great pains to differentiate the common language use of the word theory vs. the scientific definition of theory.