[6] At the 2018 U.S. Championships she won the junior pewter (ie fourth place) medal behind Alysa Liu, Pooja Kalyan and Ting Cui.

In January, at the 2019 U.S. Championships, she surprisingly won the senior pewter medal at the age of 15 (behind Alysa Liu, Bradie Tennell and Mariah Bell).

[8][9][10][11] In March, she (along with Ting Cui) represented the United States at the 2019 World Junior Championships in Zagreb, Croatia.

Harrell's injury subsequently forced her to withdraw from the rest of the season, including her place on the American team to the 2020 Winter Youth Olympics in Lausanne, Switzerland.

[13] Harrell began the season making her Challenger series debut at the 2021 CS Golden Spin of Zagreb, finishing seventh.

At the U.S. National Championships, Harrell fell twice during her short program which landed her in eighteenth place out of the eighteen skaters competing and withdrew before the free skate.