 In 1999, Fontosh won 3rd prize in the Mirjam Helin International Singing Competition in Helsinki.In 2002 she won the third prize in Plácido Domingo's Operalia International Opera Competition in Paris.On 5 September 2007, Fontosh sang at the Värmland Classic Festival together with José Carreras, among the pieces was Franz Lehár's "The Merry Widow".