In 1967 she featured with two tracks in the first vinyl LP released in Malta, with the songs Ma Ora No and Xorti u l-Imħabba, both written and composed by Ġorġ and Karmelina Zammit.
In 1971 Mallia became the first Maltese singer to record her own stereo long play on vinyl in Maltese, through the album "Songs from Malta", that was recored in London. The music was composed by Charles Camilleri and Joe Friggieri , is still a favourite. Penned by Friggieri at the tender age of 25, the lyrics were probably the first Maltese recording to be replete with fantastic characters. Songs included It-Tfajla tal-Irdum, Rajt Raġel, Il-Bejjiegħa tal-Ward and Il-Pont ta' Wied Rummiena.
She also had a single track called Nazju tal-Ibirba written by Albert Marshall and composed by Austrian Freddy Kov.
Throughout her career Mary Rose performed in Italy, the United Kingdom, Austria, Libya, Australia, Germany, Canada and Turkey. In 1982 she placed first in her category in the second "Maltese International Festival of Songs" and so won the right to represent Malta in the "Bizerte International Festival of Song" in Tunisia, which she won. From this festival she was invited to participate in a show in Germany together with international stars like Jennifer Rush, Imagination, Pupo and others.
During that show she met Teddy Lakis and they recorded the song An Island Called Amore. Promoting that record, Mary Rose gave a show for the fashion house "Sasch" where she was so well received, she was immediately offered a recording contract with Sasch record company. She was given the name "Mary Charles". Her first engagement with her new stage manager was an Italian tour with Eduardo Vianello ending in a very big show on Rai TV named "Notte Delle Stelle" with Claudio Villa, The Platters and many other Italian singers, with whom she toured for three months.
She then returned to Germany, where she recorded "Blue Summer Lies" and "A Star of Clay" composed by Mino Siciliano and Alfred C. Sant, which turned out to be her biggest success. From then onwards Mary had a lot of T.V. (Z.P.F.) Sat 1 and Sat 3 radio shows, also shows in theatres, discos and nights spots around Germany, Austria and Switzerland.
Mary Rose Mallia is also a renowned actress and had leading parts in numerous plays on stage and television, including leading roles in both successful television serials "Ir-Ronnie", "Vaganza f'Ħal Bla Ras" and as Lieni in "Simpatiċi". In the 1982 rock opera Ġensna, she was given the task of the main female vocalist, facing the indomitable Bayzo, which they successfully surpassed with wide public acclaim.
She also sang and acted main parts in operettas as "Die Fliedermaus", "Orpheus in the Underworld", "The Merry Widow, "The White Horse Inn", "The Land of Smiles", "Cin Cin La", "II Paese dei Campanelli". the musicals "King and I", "Spiru Cefai", "Taħt Tlett Saltniet", "Żeża tal-Flagship" and "Karmena Abdilla".
Still active in the music scene, in 2011 she sung in the acclaimed album Għanja, commemorating the hundreth anniversary from the birth of Dun Karm, with the song Bjuda to the composition of Dominic Galea.