[1] Rombo grew up in a musical family in Katrineholm and studied at the esthetics program at De Geergymnasiet [sv] in Norrköping.

During her studies, she made her stage debut at the Royal Swedish Opera (Kungliga Operan) in Stockholm as Christa in Janáčeks The Makropulos Affair.

[3] At the Royal Swedish Opera, she performed as Barbarina and Susanna in Mozart's Le nozze di Figaro, the First Lady in his Die Zauberflöte, Frasquita in Bizet's Carmen, Sister Blanche in Poulenc's Dialogues of the Carmelites, Musette in Puccini's La bohème, and Donna Elivra in Mozart's Don Giovanni.

In the summer of 2009, she made her debut at the Salzburg Festival in the lead role of Luigi Nono's Al gran sole carico d'amore.

Rombo performed in SVT's broadcast of the christenings of Princess Estelle and Prince Oscar and at the jubilee concert for the celebration of King Carl Gustaf's 40 years on the Swedish throne.