Why might an author use a metaphor to enhance the meaning of the fiction or poetry

A. Elenita versus the music of her parents' homeland.

Explanation: in literature, a conflict is a struggle between opposite forces, usually between a character (the main character or a very important one) and himself (internal conflict), society or another character (external conflict). In the given excerpt from Gravity by Judith Ortiz Cofer we can see an example of an external conflict between a character (Elenita) and the music of her parents' homeland, which her mother used to listen to in the evenings.