Final answer:
Without the text of 'Obasan' by Joy Kogawa, it is inappropriate to speculate on Aunt Emily's wording in her diary or its impact on Naomi.
Step-by-step explanation:
The question pertains to Aunt Emily's mention of Naomi's mother in her diary and its effect on Naomi. Although the provided texts do not contain a direct answer to the question, it can be inferred that the references to mothers, women, and their impacts serve as contextual evidence for understanding the dynamics between Naomi, her mother, and Aunt Emily. In terms of providing an answer, the relevant text was not provided and therefore, it would be inappropriate to speculate on Aunt Emily's specific wording or the reason it bothers Naomi without the correct context from the book 'Obasan' by Joy Kogawa.