[2] Left to support three young children as a single parent, Molly Callaghan started teaching music to remote students in Candelo, riding her horse between lessons.

She soon had a music studio in Sydney, and began performing under the stage name "Marie Narelle",[3] and billed as "the Australian Queen of Irish Song.

She performed at a benefit concert in London's Royal Albert Hall in 1902,[1] sharing the bill with Clara Butt and Ada Crossley.

[2] During the 1904–1905 season, she sang in New York,[4] was part of the Irish delegation at the St. Louis World's Fair,[5] and made recordings for Edison.

[2][9] She gave a concert at Carnegie Hall with both of her daughters in 1921, a fundraiser for the Woman's Hospital Alumnae Sick Benefit Fund.