She was born in Miami, to a religiously devout mother and musically inclined father. As was common in the area, Williams was exposed to African American blues and jazz, alongside Caribbean calypso. Poverty caused Williams to leave schoolat fourteen, working with her mother at a laundry. She was singing at church and on street corners, inspired by a wide range of musicians including Sister Rosetta Tharpe and the Smith Jubilee Singers. She stuck with gospel, however, in spite of pressure to switch to popular blues tunes or the opera.
Williams was invited to join Clara Ward & the Ward Singers, and stayed with them for twelve years. Her first recording was "How Far Am I from Canaan" (1948), followed by the breakthrough "Surely God Is Able", which launched Williams and the rest of the group into superstardom. Their concerts were mobbed by frenzied fans. She left in 1958 to form the Stars of Faith.
Stars of Faith was not as successful the Ward Singers, Williams' career declined until 1961. The group appeared in Black Nativity, an off-Broadway production, and toured across North America and Europe. In 1965, she began a solo career but soon returned to Miami for her mother's funeral. While there, she felt reinspired to continue her career and began touring college campuses across the country. Her perhaps best-known hit is from this period -- "Standing Here Wondering Which Way to Go".
Williams died in 1994.