The ending that best clarifies the meaning of her commentary is:
The sentence compares two people in the story who had elements of pride but the description of Elizabeth shows that she had a more stubborn pride. The writer here makes a comparison of two individuals who had the same trait.
In the same vein, she clarified the fact that one of the two had a higher degree of the character trait under discussion. This person was Elizabeth. This fact is vividly seen in this sentence: "but it seems that Elizabeth is just as proud, and perhaps even more prejudiced against Darcy."
So, while Darcy was described as a proud person, the narrator explained that Elizabeth's negative attitude toward pride and bias was worse. The statement above clarifies the commentary made by Cassy.
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