In 1965, Mignonne along with her group The Jetliners became an instant success under the guidance of manager Tony Fernando who would later become her husband, and their popularity grew.
During the early years of the group the Jetliners enjoyed star billing at the Coconut Grove nightclub situated in the Galle Face Hotel in Colombo.
In 1969, she became the first Sri Lankan to be signed up by EMI Records UK, and Keith Prowse Music London.
A Sinhala composition "Oba Nisa" was selected for the finals of the 5th Olympiad of Song in Athens, Greece in 1972[1] where it won the gold medal.
"Coconut Man" made the finals of the World Popular Song Festival in Tokyo, the first time a female singer/composer had ever done so.