This action research report examines the effects of differentiated instruction on an advanced grade 3 student named Emily. Data was collected through interviews, writing samples, math journals, and observations before and after implementing differentiated strategies for 5 months. Differentiation promoted enthusiasm, motivation, and confidence in Emily and improved her academic performance and social skills. The teacher plans to continue refining her use of differentiation and balancing individual needs with standardized curriculum and assessment requirements. Differentiated instruction benefits all students by addressing varied learning needs.