The events that take place are that she is old and the walk is very hard on her. She struggles, and has visions along the way. She runs into a dog and falls, and then the dog's owner points a gun at her and asks her if it scares her. She gets to town, and, after briefly forgetting what she came for, gets the medicine.
The resolution is that despite her age and condition, Phoenix gets the medicine and plans to get a small present besides. She wins.