Miklósa was an athlete as a teenager. Owing to an accident, she had to give up, so she turned to singing as a hobby. After less than three years, at the age of 19, she was engaged by the Hungarian State Opera House as the youngest singer ever. Her first appearance abroad was in Brussels in 1992, then she sang The Queen of the Night in the same year in Mannheim. Miklósa soon conquered all the major stages in the world with this role: she was the most sought after singer as Die Königin das Nacht from London to Paris, from Munich to New York. She has sung this role more than 500 times so far. After studying at the Ferenc Liszt Academy of Music, she was the recipient of student scholarships at the Philadelphia Academy of Vocal Arts, and the Milan Scala. She was a member of the Hungarian State Opera House until 1999, where she sang a string of roles from Adele (Die Fledermaus) and Gilda (Rigoletto) to Constanza (Die Entführung aus dem Serail). Since 2004 she has regularly appeared at the New York Met. In addition to the classical operatic roles, she enjoys performing in musicals and operettas; she has been the principal singer of a great many gala concerts. She concerns herself with causes of health, sports, charity and fostering talent. In 2011 she was the Hungarian ambassador of philanthropic work, and in 2012 she was awarded an International Fair Play Prize. During her career she has travelled through the world but she has always lived in Hungary, where she calls a small village in Fejér County her home. She was awarded the Kossuth, Liszt, and Prima Primissima Prizes. On August 20 2022 she received the highest award of Hungary: the Order of St. Stephen.