C. She focuses on her crush's reactions to her family.
Explanation:
From the text, we see that the narrator's embarrassed attitude towards her culture was as a result of her focus on her crush's reactions to her family.
She knew the Chinese culture is different from the American culture. Therefore, certain behaviors that will be put up by her family will look strange to her crush's family because they are Americans. From her attitude, we can decode that the narrator would have wished their family acted in a more "American" way in order to impress her crush and the family.
