This story is written from the third person point of view. A key indicator that the narration is third person is the usage of pronouns like "she." More specifically, the story is written in the third person limited point of view. We do get narration about other characters; however, the majority of the narration is focused on Granny. We get a lot of information on what Granny is thinking, feeling, and doing, and this is actually where the narration starts to throw curve balls at the reader. There are a few parts of the narrative that seem to blend into a first person narration. Near the end of the story we get the following lines:
She was so amazed her thoughts ran round and round. So, my dear Lord, this is my death and I wasn’t even thinking about it. My children have come to see me die. But I can’t, it’s not time. Oh, I always hated surprises.
Notice how the narrative shifts from "she" to "I." There is no usage of quotes or italics to indicate that these are Granny's thoughts, which gives readers the impression that the point of view is slipping into first person. It's a really cool section of the story because it really lets readers into Granny's mind, but if you have to pick one point of view, then the choice has to be third person based on the rest of the story.