Starting her gymnastics career at a young age, and reaching "Level 10" status -- the highest level by USA Gymnastics -- by 2020, Ava-Marie joined the Green Level High School gymnastics team as a freshman in 2021, quickly making an impact.

In 2022, she helped lead the team to its first state championship, and became the first Green Level gymnast to win individual state titles, as she tied for first place in both the floor and uneven bars events.

Ava-Marie, and the Gators, followed that performance up two years later, winning a second team state title, and another individual state championship in the All-Around.

Along with accomplishments in the classroom, Callahan graduated Green Level, and headed to UCLA, as one of the most decorated single-sport athletes of all time at The Swamp.