However, we can gather clues from how the photo was taken, where it was taken, and other photos similar to it. It's pretty obvious that the subject was posing for a portrait. Her full getup, her stance, and the chair used as a prop are cues of a planned portrait session.
This is just one of several photos taken at the same location with other Igorot subjects. Most of these photos were portraits. Here's what's interesting - some of these subjects have been identified. They included Juan Carino, his brother, and his sister.
Juan Carino is the older brother of Mateo Carino, the Ibaloi leader who owned a good portion of the land that is now Baguio City. That said, it's possible that this "Igorot girl of Tublay" belonged to the Carino clan.
Image source: Peabody Museum of Archaeology and Ethnology.