Catherine began gymnastics at the age of four after attending a friend’s gymnastics birthday party. She asked to take a recreational class, LOVED IT. Not long after, she was invited onto the competitive gymnastics team at Gedderts Twistars USA (Now named Capitol City Flips) in Lansing, MI. She was the 2016 Level 3 MI State All-Around, Uneven Bars, Balance Beam and Floor Exercise Champion, 2017 Level 4 MI State All-Around, Uneven Bars and Floor Exercise Silver Medalist and 2018 Level 5 MI State All-Around, Balance Beam and Floor Exercise Champion. Catherine was named to America's Top 100 on balance beam in level 3 and level 5.

In 2019, Catherine skipped level 6 and quickly moved up to level 7 for the 2019 season. She placed third in the all-around with a 37.100, first on balance beam and second on floor exercise at the State Championships. Catherine moved up to level 8 for the 2020 season. She qualified to the Level 8 State Championships but was unable to compete due to COVID-19 pandemic. But, she was named to America's Top 100 on balance beam in level 8. Catherine had a great level 9 season in 2021 where she won the all-around title at the State Championships. At the Region 5 Championships, Catherine finished fourth in the all-around with a 37.650 and fourth on vault and uneven bars. She qualified to the Level 9 Eastern Nationals in College Park, GA, finishing second in the all-around with a 38.025 and first on floor exercise.

As a first-year level 10 gymnast in 2022, Catherine finished second in the all-around and first on balance beam at the State Championships. At the Region 5 Championships, she placed second in the all-around and third on balance beam. She qualified to the Level 10 National Championships in Mesa, AZ where she placed 11th overall, sixth on floor exercise and ninth on balance beam out of 56 gymnasts.

When Catherine isn't busy training over 30 hours each week in the gym, she enjoys cooking, baking, painting, being outdoors and swimming. She is the daughter to David and Cassandra Guy and she has an older brother, David and a younger sister, Sarah and three dogs named Mocha, Sassy and Trina. Currently, Catherine is an honor student at Kinawa 5/6 School at Okemos Public Schools and she will graduate from high school in 2027.