As she had a beautiful voice quality of lyric coloratura soprano and inborn stage talents, and being remarkably hard-working, she started her studies of singing and piano at the Citta di Roma Conservatory with Pilarín Andres and Mª Elena Vallejo. She graduated as a Piano Teacher and as a Singing Teacher there. With the help of a FIDAH Foundation scholarship she graduated as a Musical Pedagogue from Saragossa Higher Conservatory, and she obtained a higher degree in singing and lyrical scene at the Great Theatre of Liceo Conservatory, Barcelona, with top marks. She has improved her vocal technique and repertoire with internationally well-known masters: Montserrat Caballe, Teresa Berganza, Virginia Zeanni, Ana Maria Sanchez, Enriqueta Tarres, Robert Expert, Kurt Widmer, Euduardo López Banzo, Rinaldo Alessandrini, Enma Kirby, Enedina Lloris, Ana Luisa Chova, Paul Farrington, Miguel Zanetti, Dante Mazzola, Mario de Rose, Francesca Roig, Josefina Arregui, Celsa Tamayo, Eliberto Sanchez, etc. She has been a finalist for Montserrat Caballe grants, in the "Germans Pla" Contest and in the International Music Tournament.
She was a member of the Amici Musicae, the Saragossa Auditorium choir. She has offered concerts of oratorio, opera, zarzuela (Spanish operetta) and lied as a soloist soprano with the ensemble Mas que Voces in Spain, France and Italy. She has also sung as a soloist with other ensembles and orchestras, like the "Orquesta Sinfonica de Zaragoza", the "Orquesta Sinfónica del Conservatorio Superior de Aragón", the Orquesta Sinfonica del Conservatorio Profesional de Soria, the Choir and Orchestra of the Teatro Lirico de Zaragoza, the Orquesta de Camara de Huesca, the Banda Municipal de Huesca, Banda Municipal de Santander and others.
With Luis Angel Martinez Sanchez as her accompanist, she was included in the Circuito de Artes Escenicas de Aragon. She made a very successful debut as Violetta in Verdi's La Traviata at Saragossa Auditorium, under maestro Juan Luis Martinez baton. A few days later she recorded the compact disc La opera, todo emocion, sponsored by Saragossa City Council, with Mas Que Voces. MELOMANO Magazine February 2011 / Febrero 2011: CD La Opera, todo emocion with the Chamber Orchestra Mas que Voces: She possesses a beautiful and singular timber of lyric soprano coloratura. Her album offers a serious selection of opera arias with a intelligent and not pretentious arrangements that obtain, however, a result more than brilliant
In 2010 she was Ainhoa Arteta and Montserrat Martí Caballe cover in La Boheme (roles of Mimi and Musetta). Estrella returned to interpret Musetta in December, 2011 in Bologna (Italy) under maestro Giuseppe Sforza's baton. In June, 2011 she has triumphed as Pamina of Mozart's Die Zauberflöte, production german-aragonese at Saragossa Auditorium under maestro Juan Luis Martinez's baton. OPERA ACTUAL Magazine September 2011: Estrella Cuello recreated a very expressive Pamina, her voice is of beautiful timber and possesses a great musicality .
In 2012, Estrella recorded in Milan (Italy) the absolute premieres of two operas for Operabook label: Pinotta of Mascagni (Pinotta main role) and Vanna of Pavanelli (Vanna main role). And she recorded for the same label Cavalleria Rusticana of Mascagni (Lola role) too under maestro Vito Lo Re's baton
Her repertoire also includes the roles of Gilda of Verdi's Rigoletto, Oscar of Verdi's Un Ballo in Maschera, Liu of Puccini's Turandot, Lucia of Donizetti's Lucia di Lammermoor, Norina of Donizetti´s Don Pascuale, Adina of Donizetti's L'elisir d'amore, Micaela of Bizet´s Carmen, Juliette of Gounod's Romeo et Juliette, Margueritte of Gounod's Faust, Susanna and Contessa in Mozart's opera Le Nozze di Figaro, Zerlina and Donna Anna of Mozart´s Don Giovanni, Fiordiligi and Despina of Mozart's Così fan tutte, Rosina of Rossini's Il Barbiere di Siviglia, Cleopatra of Handel's Giulio Cesar, Francisquita of A.Vives's zarzuela Francisquita, and Marina of Arrieta's Spanish opera Marina.
She has combined her artistic activities with teaching music at secondary schools and giving singing lessons at the Conservatory and the University. She studied Economic Science in the UNED and she obtained a degree in Law from Saragossa University and a Master of Management in Foreign Trade from ESIC.