Ritika Mishra focused on improving UI reliability in the Expensify/App repository by addressing a bug affecting the Per Diem import preview for small data sets. She identified that the flexWrap property in the CSS styles was causing misalignment, which led to inconsistent data presentation and potential user confusion. By removing flexWrap, Ritika ensured that the UI rendered consistently across varying data sizes, enhancing the accuracy of the Per Diem workflow. Her work demonstrated proficiency in CSS, UI design, and front end development using TypeScript. The change was carefully documented and committed, reflecting disciplined debugging and change management practices.