Final answer:
The question does not provide a consistent narrative about Miss Strangeworth, making it hard to say exactly what happened to letters when she made mistakes on them in literature broadly, mistakes with letters can lead to various consequences.
Step-by-step explanation:
When Miss Strangeworth made mistakes on her letters, they are described differently across various stories, as the excerpts provided do not pertain to a single narrative about Miss Strangeworth. For instance, in stories featuring characters who mistakenly handle letters, such as forgetting to deliver a telegram or examining a letter's appearance as in the excerpt from 'The Purloined Letter', the outcomes of mistakes vary from creating suspense to the failure of delivering important messages. Since there is no clear reference to Miss Strangeworth, it is difficult to provide a definitive answer as to what happened to the letters when she made mistakes on them. However, in general literature, a character's errors with letters could lead to misunderstandings, unanticipated consequences, or changes in the story's direction.