Final answer:
Without the specific text where Jeannie is mentioned, it is impossible to determine her relationship to Sarah Smarsh as none of the provided information confirms this relationship.
Step-by-step explanation:
In the context referenced, if Jeannie is an important person in the book and has the familial relationship to Sarah Smarsh as suggested by the options, none of the provided information from Harriet Bailey or the blog post about Chinese maternal grandmothers directly answers who Jeannie is to Sarah Smarsh. It would be necessary to refer to the specific text in question to accurately determine Jeannie's relationship to Sarah Smarsh.
As Harriet Bailey is described within the provided text, she is the daughter of Isaac and Betsey Bailey, making them her maternal grandparents. Without additional context from the book that mentions Jeannie, we cannot confidently match this information to any of the provided choices.