[2][3][4][5] Her notable works include the 2012 film Don't Stop Believin': Everyman's Journey, featuring the band Journey and its new lead vocalist Arnel Pineda, which won the Audience Award for the 2013–2014 season of PBS's Independent Lens;[6] and the 2003 film Imelda, about the life of Imelda Marcos, former First Lady of the Philippines.

[7][8][9] Three of Diaz's films have screened at the Sundance Film Festival: Imelda, a biographical documentary about Imelda's beginnings as a beauty contest winner to the wife of rising politician and eventual President of the Philippines, Ferdinand Marcos.

Motherland, a documentary set at an overcrowded and under-resourced maternity hospital in Manila;[10] and most recently A Thousand Cuts a profile of Nobel laureate Maria Ressa, a journalist working in the Philippines, released in 2020.

[11] Motherland received a Special Jury Award at Sundance in 2017 and premiered the same year at the Berlin International Film Festival.

[12] Diaz served as a Documentary Competition Juror at the 2023 Sundance Film Festival.