Tremblay began her career in 2007 after moving to
Lincoln, Nebraska, where she made her first documentary film,
Tiny Red Universe (2007), serving as writer and director. In 2012, Tremblay released
Heartland: A Portrait of Survival. The documentary was shown at the
Omaha Film Festival, and at the
St. Louis International Film Festival. Two years later, she released
In the Turn, a documentary film that revolves around Crystal, a ten-year-old
transgender girl from
Timmins,
Ontario. During this period, Tremblay also worked closely with grassroots organizations like the National Indigenous Women’s Resource Center and Wica Agli, using film as a tool for advocacy on issues such as violence against Indigenous women and restorative justice. In 2017, she joined
Bustle as director of video. Before joining that magazine, she worked for
Hearst Digital Media. In 2018, Tremblay was selected for the
Sundance Institute's Native Filmmakers Lab, a development program for emerging Indigenous filmmakers. On
Reservation Dogs, Tremblay served as a co-producer, writer, and director on multiple episodes, helping to shape the show’s honest and humorous portrayal of modern Native American life. She also wrote and directed for the AMC series
Dark Winds, a noir thriller centered on Navajo Nation law enforcement, contributing to Seasons 1, 3 and 4. In April 2023, the first episode of the first season, "Monster Slayer", of
Dark Winds was honored as an Outstanding Fictional Television Drama by the Western Heritage Awards of the National Cowboy & Western Heritage Museum. In May 2023,
Dark Winds received several Vision Awards from the National Association for Multi-ethnicity in Communications (NAMIC). It received the award for Best Drama, and for Best Performance in a Drama Series, awarded to Zahn McClarnon. In 2023, Tremblay made her feature film directorial debut with
Fancy Dance, which she wrote, directed, and produced.
Fancy Dance premiered at the 2023 Sundance Film Festival and was met with critical acclaim for balancing its heartbreaking subject matter with moments of humor and hope drawn from Native resilience. It was supported in part by the
Cherokee Nation film initiative. The film was acquired by Apple Original Films in 2024. In 2026 Tremblay directed an episode of the
Netflix series
Little House on the Prairie. ==Personal life==