Representing Hope Valley, Hill was crowned Miss England 2017 by outgoing titleholder Elizabeth Grant after bested 49 other delegates at the national finale held at Resorts World Birmingham on 14 July 2017. The win qualified her to represent her country at Miss World 2017 which was later held on 18 November 2017 in Sanya, China.
Miss World 2017
During the process of the pageant, Hill managed to be shortlisted in three challenge events: top 20 at Beauty With A Purpose; top 8 at Multimedia; and 3rd runner-up at Talent. She also won continental title, Miss World Europe. On the final night she was 2nd runner-up; making her the most successful contestant ever to represent England at the competition.
Miss Universe Great Britain 2020
On March 8, 2021, Stephanie Hill competed in Miss Universe Great Britain 2020, which was held virtually. Despite being a heavy favourite at the said competition, Stephanie failed to win the coveted title. After this competition ended, Stephanie Hill returned to work focusing on Urgent Public Health Studies, focusing on COVID-19 clinical trials.