Monaghan started her career as a child model at the age of 8. At the age of 14, she auditioned for girlfriend model search and was a runner up. She then signed with Viviens model management at 14. In 2013, Monaghan appeared in Naomi Campbell’s TV show, “The Face.” She was one of the finalists in the show and was mentored by Naomi Campbell. After the show, at age 17, she signed with Chic Model Management Australia and Women Management in New York.