Prior to being cast as Eva Perón in the West End revival of Evita, Roger was already an accomplished performer in her native Buenos Aires. In 1997, she was nominated for the Trinidad Guevara Award as Best Breakthrough Female for her work in Yo Que Tu Me Enamoraba. She went on to appear in a number of productions including Nine, Houdini, Beauty and the Beast, and Fiddler on the Roof, as well as starring in Les Misérables as Fantine, and Saturday Night Fever as Annette. For the 2002/2003 season, she was nominated for an ACE Award for Best Actress in a Musical for her role in Jazz, Swing, Tap. The following season, she starred in the show, Mina...che cosa sei?, which she coauthored with the show's director, Valeria Ambrosio. Roger won the ACE Award for Best Actress in a Musical for this performance. She has also appeared on several Argentine television programs, including Hombres de Honor, Pensionados, and El sodero de mi vida. Internationally, she briefly toured Europe with Tango por Dos.