Heidegger was born 17 September 1961 in Chur as the daughter of Werner Heidegger and Ruth Foser as one of two children.
She trained as a pharmaceutical assistant at the KV business school in Chur from 1977 to 1980, and worked as one at Schloss-Apotheke in Vaduz from 1977 to 1984.
In 2005 she obtained a degree in business administration in Sargans.
Since 2010, she has been an assistant to the management of the board of directors at the Liechtenstein power plants.
[1] From 2021 to 2025, Heidegger was a member of the Landtag of Liechtenstein and also the head of the Liechtenstein delegation to the Organization for Security and Co-operation in Europe.