[3] Mejia worked as a reporter for MTV covering the 2000 U.S. presidential election[3] and an organizer with Massachusetts Charter Public School Association.

Mejia wrote, "I am no longer interested in having drip-drop incremental changes that expect us to continue to hope and pray and wait some more about finally having the type of budget that really reflects the needs our people find themselves in today.

"[8] In 2020, the Boston Magazine named Mejia the year's "best city politician", writing that she had, "fought back against racist harassment after taking office in early 2020," and, "also worked to improve bilingual communications in Boston and even made a series of TikTok videos with her daughter to liven up the mood at City Hall during the early days of the [Covid-19] pandemic.

"[9] In 2023, a city council attorney filed an internal complaint against Mejia and fellow councilors Ricardo Arroyo and Kendra Lara accusing all three of bullying and lambasting her during an April meeting.

[11] Mejia, Ricardo Arroyo and Brian Worrell introduced an ordinance to create an Office of Cultural Affairs in the city.