
In a 2019 article in The Lion and the Unicorn, Karen Chandler calls The Second Daughter (along with Joyce Hansen's novels that foreground young Black protagonists) "just as relevant, arguably, as they were when they first fifteen or twenty years ago." She adds that these books "offer a much-needed antidote to a U.S.


Walter's 2011 historical fiction novel, The Second Daughter: The Story of a Slave Girl, is based on the true story of Mum Bett, a former slave who successfully sued for her freedom. Publishers Weekly wrote that "Walter's heavily footnoted text may prove somewhat slow going for the general reader, but she has uncovered much eye-opening material." Kirkus called it a "compelling account," and a "sobering message about the real cost of democracy." Walter's nonfiction works include Mississippi Challenge (1992), which describes the history of African Americans in Mississippi from slavery, through the Civil War, Reconstruction, and civil rights activists' efforts to overturn racist voting laws in the state. Walter's other works of fiction include Ty's One-Man Band (1980), Justin and the Best Biscuits in the World (1986), and Mariah Loves Rock (1988). Lillie of Watts was followed by a sequel, Lillie of Watts Takes a Giant Step (1971). Since the publication of her first book in 1969 ( Lillie of Watts, about a girl growing up in the Watts neighborhood of Los Angeles), Walter has published over 20 books for children. Walter began writing when she realized there were few books for young readers about Black children, written by Black authors. Walter worked as a consultant at Western Interstate Commission of Higher Education in Denver, and as a consultant teacher and lecturer at Metro State College in Denver. She earned a master's degree in education from the Antioch College extension in Denver. Walter moved to Denver, Colorado, in 1970. Both Mildred and Earl were active in civil rights activism as members of the Congress of Racial Equity (CORE), of which Earl eventually became national vice chairman. In Los Angeles, she met her husband, Earl Walter, to whom she was married from 1947 until his death in 1965.

She completed certification requirements in elementary education at California State College. In 1944, following graduation, Walter moved to Los Angeles and worked as a school clerk. She earned money for tuition by working in the defence industry during World War II. Walter earned a bachelor's degree in English from Southern University at New Orleans.
