A worn Path

I enjoyed reading "A Worn Path" although i didn't understand the theme . Its about an elderly African American woman i believe during the 1940's or so traveling a long journey through the wilderness to retrieve medication for her grandson who injured his throat by accidently drinking lye, along the way she meet a friendly young white male.. through the story she recived 10 cents that she later promised would go towards a paper windmil for her grandson. im guessing the charity she recived along the was was some sort of reward for enduring all that traveling for her grandson when in the end she had lost the reason why she traveled in the first place yet continued. Like i said im not really sure on what the theme and purpose of the story was but i still enjoyed it