Hedvig Falk belonged to the first group of singers hired at the foundation of the Royal Swedish Opera in Bollhuset in 1773.
Similar to the case of Elisabeth Olin, Wigert was a member of the upper class, and though she herself was willing to participate, her employment was delayed by the disapproval of "Two old powder-witches" in her family.
Eventually, she was given a contract which stipulated that she would be allowed to resign whenever her family wished her to, as long as she participated in the inauguration performance.
After Doris in Thetis och Pélée, in the inauguration performance of the Opera 18 January 1773, (where she played opposite Carl Stenborg (Pélée), Elisabeth Olin (Thetis), Lars Lalin (Jupiter), Anders Nordén [Wikidata] (Neptune), Nils Gustav Stenborg (Mercury), (Elisabeth) Betty Olin (Amor) and Hans Björkman and Johan Filip Lising).
Her best remembered part was the title role of Mérope by Voltaire in the 1777–78 season after her marriage, where according to the papers, she "was given lively approval" by the audience.