Dearbhla began learning the violin at the age of 6, joining her local youth orchestra at 10, and becoming the youngest member of County Kildare Orchestra two years later. She went on to lead a number of string quartets, and was appointed co-principal violin with the Southeast Regional Youth Orchestra. From a young age she perfomed at weddings, functions and musicals, as well as taking on her first pupils. From the age of 14, her most significant teacher was Maeve Broderick.
She then studied Music at Queen's University Belfast, performing in chamber and opera orchestras along the way. She graduated with a First Class Honours degree in 2008. Next she moved to London to pursue a Masters in Music, and there performed in various ensembles, including the Rehearsal Orchestra.
Since moving to Berlin in late 2010, Dearbhla has been active as a teacher and performer. She teaches violin at the Hans Werner Henze Musikschule Marzahn-Hellersdorf, and also offers private lessons. She performs solo for occasions from weddings to parties and other events. She plays in a string trio with Anna O'Faolain de Bhroithe and Michael Voigt and will make her debut with the Walshaw piano trio in June 2020.
Dearbhla plays on a 2002 Michel De Hoog violin, specially commissioned for her.