Mullen began to write poetry as a college student in a multicultural community of writers, artists, musicians, and dancers in Austin, Texas. As an emerging poet, Mullen received a literature award from the Black Arts Academy, a Dobie-Paisano writer’s fellowship from the Texas Institute of Letters and University of Texas, and an artist residency from the Helene Wurlitzer Foundation of New Mexico. In Texas, she worked in the Artists in Schools program before enrolling in graduate school in California where she continued her study of American literature and encountered even more diverse communities of writers and artists.