She describes herself as a "bitter, angry, cold-hearted, low-rent, nasty, jerky, grouchy, lying, mean, hurtful, selfish, greedy, sniveling witch that doesn't believe in magic." In "Crabby Author", Arnold was able to straighten her out a little when he said she probably doesn't believe in magic and herself. After that, she finally wrote a new book and went back to writing. She made a cameo on the beach at the end of "Summer Love," implying that she stopped being a hermit.
Her name is most likely derived from British crime writer Agatha Christie (who is best known for her stories starring the character Hercule Poirot) and Holden Caulfield from J.D. Salinger's novel The Catcher in the Rye. Like Agatha, J.D. Salinger was a popular novelist who went into reclusion and stopped writing for decades.
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