Mejia is a first generation-American of Guatemalan and Mexican descent. She grew up in the Inland Empire region of California.
Mejia played Val in Ann Marie Pace's 2021 short film Growing Fangs, one of a series of productions featured as part of the Disney+ Launchpad series. The same year, she made her television debut as a guest star on season 11 of Curb Your Enthusiasm, playing short order cook turned terrible actress Maria Sofia Estrada. Originally cast for one episode, she went on to appear in six of the season's ten episodes. She would guest star again in season 12, where her character has become a popular actress.
In 2021, Mejia also starred in the final episode of On My Block. It was later announced she would appear in the spinoff series, Freeridge, alongside Bryana Salaz, Ciara Riley Wilson, and Tenzing Norgay Trainor.

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