Your question is interesting because it seems to imply that Granny Weatherall has actually managed to process and deal with her feelings of hurt and rejection about being jilted in her youth. Actually, I believe a careful analysis of the story indicates that she has in no way dealth with her pain and emotions at being jilted, as her focus on this incident in her last hours indicates. One part of the text that clearly points towards this conclusion is when she decides she wants to see the man that jilted her again. Note what Granny Weatherall thinks to herself:
Yes, she had changed her mind after sixty years and she would like to see George. I want you to find George. Find him and be sure to tell him I forgot him. I want him to know I had my husband just the same and my children and my house like any other woman. A good house too and a good husband that I loved and fine children out of him. Better than I hoped for even. Tell him I was given back everything he took away and more.
Clearly this quote shows she has not really forgotten George and what he did to her. Why would she feel the need to send him a message if this were so? The above quote suggests that Granny feels the need to get back at George for what he did to her, but it is obvious that Granny feels that there was something missing in her life. Therfore, I don't think this excellent story suggests that Granny Weatherall has overcome the pain of being jilted. It is still very much with her, and she bears it up to her death.