The statement made by the speaker was to imply that she mistakenly believed that these skills would be sufficient to get her a job.
From the story, it can be inferred that the speaker had mistakenly believed that her skills would enable her to find work. She kept believing that her skills would secure for her some modest position.
Therefore, the statement "plain English and good writing" was to imply that she mistakenly believed that these skills would be sufficient to get her a job.
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