Cady Heron is famous for:
* Being a "new girl" who gets caught up in the world of high school cliques. She goes from being homeschooled in Africa to attending North Shore High School and quickly becomes entangled with the popular "Plastics" group.
* Her "fetch" catchphrase. Though it's a running gag in the movie that "fetch" is not going to happen, the phrase became a popular meme and represents Cady's naiveté and transformation throughout the film.
* Her comedic journey. Cady's experiences navigating high school drama, friendships, and romantic interests are hilarious and relatable.
* Her overall character arc. While she initially embraces the Plastics' ways, Cady eventually realizes their toxicity and learns to be true to herself.
If you're referring to a different "Cady," please provide more information! 😊