In 1986, Lehfeldt made her film debut as the nurse Henriette in Helle Ryslinge's Flamberede hjerter, earning the prized Bodil Award for best actress.
Since her partner Stig Hoffmeyer died in 2022, she has continued performing the role of Gerda in the TV series Minkavlerne, now in its fourth year.
After matriculating from Aarhus Katedralskole in 1973 she applied to attend Statens Teaterskole in Copenhagen but was rejected as the jury thought that at only 43 kilos she would be too small and her voice would be too weak.
She also performed more serious roles such as Natasja in Idioten (The Idiot) based on Dostoevsky's novel at Aveny Teatret and Winnie in Samuel Beckett's Happy Days at the Hippodrom in 1995.
[2] Lehfeldt has been active in several Danish television series since 1984, including Landsbyen and Gøngehøvdingen and more recently Carmen Curlers and Guru.