What is the main conflict in The Woman Who Came at Six O'Clock by Gabriel Garcia Marquez?

The story tells of an unnamed woman prostitute who comes into José's diner everyday at six o'clock for a free meal. One day, she comes in and convinces him to say that she came in earlier so that she has an alibi for the murder she has just committed. The story explores such themes as the justification of murder, the power of a person's reputation, and the different realities that people experience.