From the AppleTV+ description:
The film follows Jax (Gladstone), who has cared for her niece Rokie (Deroy-Olson) since her sister’s disappearance by scraping by on the Seneca-Cayuga reservation in Oklahoma. Every spare minute goes into finding her missing sister while also helping Roki prepare for an upcoming powwow. When she risks losing custody of Roki, the two hit the road and scour backcountry to track down Roki’s mother in time for the powwow.
Starring Lily Gladstone and directed by Erica Tremblay, it streams on Apple + June 28.