The climax is defined as the section of the plot which represents the part of the story which is the most emotionally engaging after the rising action has raised the tension of the story to fever pitch. When we think about this definition and this story, the climax can clearly be seen when Marian has her confrontation with Peter at the end of the second section of the story. She does this by baking a cake-woman and using this as a test for Peter. When he fails to take part in the parody, Marian symbolically eats the cake herself, showing her rejection of the gender roles that she feels are forced on her and going further on to indicate that she has now conquered her eating disorder.
This climax comes just before the resolution of the story, which shows Marian preparing herself to move on. Now that she has rid herself of Peter, she is free to clear up the apartment and prepare for a new home. She tells Duncan she is better and watches as he eats the rest of the cake.