[1] Sullivan made her senior debut at the 2022 Winter Cup, where she won bronze on balance beam.

As a result she was selected to compete at the DTB Pokal Team Challenge in Stuttgart alongside Skye Blakely, Emjae Frazier, Nola Matthews, and Konnor McClain.

[4] In February, she competed at 2023 Winter Cup, where she won silver in the all-around and bronze on balance beam and floor exercise.

[7] In May, she competed at the 2024 Core Hydration Classic where she placed eleventh on uneven bars, thirteenth on floor, and twentieth in the all-around.

[11] In February, she competed at the 2025 Winter Cup where she won gold in the all-around, silver on floor, bronze on balance beam and placed fourth on uneven bars and fifth on vault.