Armstrong is a passionate writer who deals with such important issues as education and indigenous rights of Native people in her books. She is a talented writer who writes for both adults and young people. She includes young people in her audience because she wants to educate them about Native culture and history. Her first novel, Slash, tells about a young Okanagan man, Thomas Kelasket, who is in search of himself. His family clings to a traditional Okanagan life, one that includes pow-wows and hunting. Although some of his friends tease him, Thomas secretly admits that he likes speaking the Okanagan language and attending the pow-wows.