How is point of view used to reveal the theme of control or appearance vs. reality in "The jilting of Granny Weatherall"?

The narrator of this story is a third-person omniscient narrator who can see into the mind of Granny Weatherall. The reader is privy to her innermost thoughts as she is on her deathbed.  Because Granny is reflecting on her life, we see her thoughts shift from her children to her jilting at the altar to the pesky doctor who examines her and more.  The reader is allowed in to a world of stream of consciousness through a narrator, really.  This gives the narrator a certain amount of control; however, Granny ultimately has control over her own thoughts and as she is dying, we are exposed to a bevy of thoughts she has and the sense of bitterness she has at not having a sign before she dies.