What diligent qualities does the author present in her story "Sweat"?

Delia Jones demonstrates diligence in "Sweat" through the following actions, character traits, and personal history revealed to us in the short story.
Delia works late on Sunday nights to prepare her workload for the week and save time. She conscientiously sorts clothing by color and soaks soiled items, even though her husband, Sykes, does not approve of her bringing "white folks'" laundry into their home.
We learn that Delia has been faithfully washing clothes for fifteen years, which is the entire length of her marriage to Sykes. She is the breadwinner in the household, and her physical beauty has faded over the years due to her overworked state. Sykes has rarely held a job during this time period and instead wastes their money on frivolous expenses.
Delia steadfastly remains in a physically, emotionally, psychologically abusive marriage in which her husband is publicly unfaithful. She attempts to ignore his affair with Bertha by avoiding public meeting places and local acquaintances, and she changes churches so that she will not be required to take a holy sacrament with him.
Despite a long history of abuse, Delia boldly stands up to Sykes after he brings a pet rattlesnake home to torture her. She expresses her hatred towards him and threatens to expose his actions to the "white folks" if he lays hands on her again.
After Sykes tries to kill Delia by planting the rattlesnake in her laundry basket, she flees the house and waits in the hayloft during the night, then outside of the house once he returns in the morning and is attacked by the snake. After he pleads for her help, she calmly waits beneath a tree in the yard until his inevitable death.