After the birth of her two sons, Michael and Robin, in 1949 and 1954, Lewis began to work as a choreographer. In 1956, she created the choreography for the productions The Bartered Bride of Smetana at Grosvenor High School in Belfast, for a performance of Dvořák's The Golden Spinning Wheel at the Belfast Ballet Club, and for a Macbeth at the Lyric Theatre, Belfast. Lewis also taught modern dance, and in 1962 started the Belfast Modern Dance Group.
