The speaker's reasoning revolves around the values she was taught by her mother and how these values align with her vision for the country, which is echoed in her commitment to serve and to unite the nation. Thus, the most fitting response is:
She talks about the values her mother raised her by and how she shares those values with Joe Biden.
This response highlights how her personal background and upbringing influence her vision for the country, linking her experiences and values with her current political mission alongside Joe Biden.