She is best known for her roles as Georgia "George" Fan in The CW series adaptation of Nancy Drew (2019–2023) and Ellie Chu in the Netflix comedy-drama film The Half of It (2020).

She also has starred in her voice lead role as Ember Lumen in the Pixar animated film Elemental (2023).

Lewis was adopted from an orphanage in Shanghai when she was eight months old and raised in Windermere, Florida.

[6] Leah discovered performing arts at Crenshaw School in Orlando, Florida.

[9] Once she moved back to Los Angeles after graduating from high school, she began booking roles in TV shows like Station 19 and The Good Doctor.