Hopkin opted to swim at the University of Arkansas, and immediately it seemed like a mutually beneficial decision for both parties. At Arkansas’ mid-season rest meet, the Mizzou invite, Hopkin shattered the Arkansas school record in the 100 freestyle with a time of 47.05. And that was only the beginning. At the SEC Championships, Hopkin had runner-up finishes in both the 50 (21.58) and 100 (47.10) free, as well as a 5th place finish in the 200 free (1:44.56). At the NCAA Championships, Hopkin kept the ball rolling as she placed 2nd in the 100 free (46.56) and 5th in the 50 free (21.51), both new school records and best times.
In 2017, Hopkin won the 50 free at the British Swimming Championships. She went on to represent Britain at the World University Games that summer.