I just want to say that I really love that they're using the pronoun "she" in the beginning. It is refreshing to hear when most business books are directed using male pronouns.
'her company' for the abstract founder's business is just as wrong as 'his'.
The solution is the firmly established use of the singular "They": https://en.wikipedia.org/wiki/Singular_they
The singular "They" has literally been used in the English language since the 14th century, and its usage is well-understood. Any English teacher who dissuades you from its use should be stripped of their credentials, because "they" are an idiot.