Brooklyn's mom did gymnastics as a child and her mom thought Brooklyn would enjoy it. So, Brooklyn started taking recreational gymnastics for fun at the age of two. At age four, she started training at World Olympic Gymnastics Academy (WOGA) in Plano, TX and has been there ever since. As a level 4 gymnast in 2015, Brooklyn placed seventh overall with a 37.925 and sixth on balance beam at the State Championships. In 2016 as a level 5 gymnast, she finished fifth in the all-around with a 38.200 and fourth on vault.

Brooklyn skipped level 6 and quickly moved up to level 7 for the 2017 season. At the State Championships, she finished ninth in the all-around with a 38.200 and fifth on vault. She qualified to the Region 3 Championships. As a level 8 gymnast in 2018, Brooklyn qualified to the State Championships and Region 3 Championships. She continued competing level 8 in 2019, finishing fifth in the all-around with a 37.700 and third on balance beam at the State Championships. At the Region 3 Championships, she placed fifth in the all-around with a 37.175, first on uneven bars and balance beam.

As a first-year level 9 gymnast in 2020, Brooklyn qualified to the State Championships but was unable to compete due to the COVID-19 pandemic. In 2021, she placed sixth in the all-around and third on vault at the State Championships. She qualified to the Level 9 Western Nationals after finishing seventh overall and second on balance beam at the Region 3 Championships. At the Nationals, she placed ninth on balance beam. Brooklyn was injured and missed the 2022 season.

In 2023 as a final year level 9 gymnast, Brooklyn finished fourth on balance beam at the State Championships. At the Region 3 Championships, she placed second in the all-around with a 37.300, first on uneven bars and second on vault. Brooklyn qualified to the Level 9 Western Nationals for the second time, finishing seventh in the all-around with a 37.150 and first on uneven bars. Brooklyn's uneven bars title landed her in the America's Top 100 with a 9.725. In 2024, Brooklyn placed second in the all-around at the Level 9 State Championships and Region 3 Championships. She qualified to the Level Western Nationals, finishing 11th in the all-around and sixth on balance beam.

When Brooklyn isn't busy training over 25 hours each week in the gym, she enjoys drawing, painting, listening to music and playing computer games with friends. She is the daughter of Bill and Julie Dietrich. She has a brother, Austin who also is a gymnast at WOGA. Currently, Brooklyn is an honor student at Texas Connections Academy and she will graduate in 2026.