The main character seems convinced that the difficulty she experiences... is due to her inability... but it's not.
Who said that the characters in good stories must never be mistaken?
Sure, but this isn't just a story, it's a story that tries to make a point about the negative consequences of rationality for some humans in the real world. Her belief isn't merely her belief, it's also a step in an argument.
Poignant short story about truth-seeking that I just found. Quote:
The full thing reads like a flash tour of OB/LW, except it was written in 2001.