Margie Cao contributed to the Michonster/rPI-Arcade repository by delivering three feature updates focused on improving emulator documentation, user interface, and layout flexibility. She enhanced emulator descriptions to clarify features, compatibility, and save-state behavior, making onboarding and usage more intuitive. Using React and TypeScript, Margie refined the DetailsMain view with layout adjustments, a dedicated emulator name header, and improved back button accessibility. She also introduced dynamic width and height properties to the RotatingImage component, enabling consistent rendering across devices. Her work demonstrated a thoughtful approach to UI design and data management, addressing both usability and maintainability within the project.