Millett received her BFA from the University of California, Berkeley and an MFA from the California Institute of Arts. She was an artist-in-Residence at the Whitney Museum Independent Study Program and the Studio Museum in Harlem. She has exhibited at prominent institutions including the New Museum, New York; P.S. 1, New York; Museum of the African Diaspora, San Francisco; Oakland Museum, CA; Crocker Art Museum, Sacramento; Yerba Buena Center for the Arts, San Francisco; Santa Monica Museum of Art, CA; The Museum of Contemporary Art, Atlanta; The Contemporary Art Center, New Orleans; Barbican Gallery, London, San Jose Quilt and Textile Museum; and at the California African American Museum, Los Angeles, which hosted a critically acclaimed solo exhibition of her work in 2019. Millett has taught at Columbia College in Chicago, UC Santa Cruz, Cooper Union in NY, and California College of the Arts. Millett currently lives and works in Oakland, California.