Borg was born on Södermalm in Stockholm and began her career in the Södermalm-based variety show group Vårat gäng ("Our Gang") after having won a song competition organised by the magazine Vecko-Revyn in 1943.

She participated in his radio program Fyra kring en flygel ("Four around a grand piano") and was the prima donna of several versions of the Knäppupp variety show between 1952 and 1962.

When the prolific comedy duo Hans Alfredson and Tage Danielsson were writing for Knäppupp they provided her with songs such as Alla kan ju inte älska alla här i världen ("Everyone can't love everyone"), Aldrig har jag sett en rak banana ("I've Never Seen a Straight Banana"), and Du är min tekopp ("You are my teacup").

From 1964 onwards Borg performed in several variety shows with Hagge Geigert in Uddevalla and Gothenburg, and a sojourn at Folkan with Kar de Mumma.

In 1960, she performed as Hasse Alfredson's duet-partner in the comic Oj då kära nån and Märta Melin och Ture Tyrén and was awarded the honour of singing a duet with Evert Taube in two recordings of Invitation till Guatemala and Mary Strand.

Stig Anderson, Björn Ulvaeus, and Benny Andersson gave her a final hit with the song Ljuva sextiotal, which stayed in the Swedish charts (Svensktoppen) for 20 weeks in 1969.