[4][9] Her operatic repertoire includes Violetta (La traviata), Musetta and Mimì (La bohème), Micaëla (Carmen), Lucia (Lucia di Lammermoor), Helena (A Midsummer Night's Dream), Liu (Turandot), Manon (Manon), Contessa Almaviva (Le nozze di Figaro), Giulietta and Antonia (The Tales of Hoffmann), Dido (Dido and Aeneas), and Donna Elvira (Don Giovanni).

[10] In the 2008–2009 season, Blue made her debut with the San Francisco Opera as Clara in Porgy and Bess; she was the featured soloist with the Valdosta Symphony in Valdosta, Georgia, where she sang the soprano role in Arthur Honegger's King David; and she performed scenes from La traviata (Violetta) with the Korean Symphony Orchestra Germany in Seoul and Busan, Korea.

In the 2009–2010 season, she was a featured soloist with the Riverside Philharmonic; the Adrian Symphony in Adrian, Michigan; Giro Italia tour with Alberto Zedda throughout Italy; Madrilenos por Haiti concert with La Orquesta Clasica de Espana in Madrid; A Gala Evening with Thomas Hampson in Budapest, Hungary; and she made her debut at the Palau de les Arts Reina Sofía as Micaëla in Carmen, opposite Marcelo Álvarez and Elīna Garanča, conducted by Zubin Mehta.

She began touring with Plácido Domingo in 2011 opening the Kaufmann Center in Kansas City, Missouri; the Royal Opera House Muscat, Oman, and concerts in Beijing, China, as well as Zagreb, Croatia.

In July 2010, Blue was honored to be a part of the 17th Annual Verbier Festival in Switzerland, where she sang in an "Operalia Tribute" Concert sponsored by Rolex.

She was the only soloist invited to sing for the American Friends of the Israeli Philharmonic in a Tribute Concert to honor the film composer Hans Zimmer.

[19] In September 2024, Blue appeared at the Last Night of the Proms, performing two opera excerpts by Puccini: Gianni Schicchi – O mio babbino caro and Tosca – Vissi d’arte.

She also performed two spirituals with the pianist Stephen Hough, and the aria Al pensar en el dueño de mis amores from the operetta Las hijas del Zebedeo, by Ruperto Chapí, as well as Rule Britannia by Thomas Arne.

In 2010 Blue was a featured soloist on the Madrileños por Haití concert with the Orquesta Clásica de España in Madrid, Spain.