Lily Gladstone knew she wanted to be somewhere special when the Oscar news came. And that somewhere was not home, watching on TV, but in Oklahoma with the Osage community, where the real-life version of her character lived and where Martin Scorsese’s “Killers of the Flower Moon” is centered. “I decided that I wanted to be on the Osage reservation, should this news come in today,” Gladstone said in an interview shortly after receiving her historic nomination for best actress, the first Native American so honored.