Martines debuted at a very young age as a Dancer at the Zurich Opera House in 1972. After some time working in the United States, including the Chicago City Ballet, she moved to Rome where she worked at the Teatro dell'Opera. In 1985 she began her collaboration with RAI, with the lunchtime chat / quiz show Pronto, chi gioca?; she later gained great popularity with the Saturday Night shows Fantastico and Europa Europa, and then for her portrayal of Princess Fantaghirò in the Fantaghirò series.
Martines has a daughter, called Stella Lelouch, with husband Claude Lelouch who she was married to from 1995-2009. In 2012 at the age of 49, she had a son, Hugo, with her partner since 2008 Cyril Descours who is 20 years her junior.