For the Royal Opera House Covent Garden, her roles have included Flora (La traviata), Third Nymph (Rusalka), Maddalena (Rigoletto) in the Placido Domingo Gala, Third Innocent (Minotaur), Albina (La donna del lago), Maddalena (Il viaggio a Reims), and Suzy (La rondine). Additionally, she covered Fenena (Nabucco), Flosshilde (Rheingold/ Götterdämmerung), Dorabella (Cosi fan tutte), Meg Page (Falstaff) and La Marchesa Melibea (Il viaggio a Reims).
Whilst at the RWCMD, she performed Meg Page (Falstaff), Eboli (Don Carlos), Pauline (The Queen of Spades), Carmen (Carmen) and Beatrice (Beatrice et Benedict) in excerpts, Dido (Dido and Aeneas) with the Welsh Baroque Orchestra, scenes as Romeo (I Capuleti e i Montecchi) and the title role (Carmen) with the Welsh National Opera orchestra, and The Witch (Hänsel und Gretel) with Scottish Opera.
In 2013/14, Justina returns to the Royal Opera House as Flowermaiden in Parsifal and makes house debuts with English National Opera as Maddalena (Rigoletto) in a new production by Christopher Alden, and with Welsh National Opera as Fenena (Nabucco). The production will be also be presented at the Savonlinna Festival. She will return to the Royal Opera House in 2014/15 as Maddalena (Rigoletto).
Recent and future highlights from the concert platform include Verdi's Requiem with the Simón Bolívar Orchestra under the baton of Gustavo Dudamel, Mahler’s Symphony No.8 with Esa-Pekka Salonen and the Philharmonia Orchestra, Dvorak’s Stabat Mater with the Lithuanian State Symphony Orchestra at the Pazaislis Music Festival, Britten’s Phaedra, Wagner’s Wesendonck Lieder with the Orchestra of the Royal Opera House under Barry Wordsworth and Dulcinée (Don Quichotte) with Chelsea Opera Group. With Iain Burnside she has recorded Rachmaninov songs for the Delphian label, also to be presented at Wigmore Hall later this season.
Justina has recently been awarded the Worshipful Company of Musicians’ Silver Medal and the Llais Llanbed Award, and was a finalist in the Stuart Burrows International Voice Competition. She studies with Buddug Verona James.