A few years later Löfgren was discovered by the Swedish rock singer Rock-Olga at the nightspot Nalen in Stockholm.

Her breakthrough came soon after in 1962 with the song "Regniga natt",[1] which was certified gold (sold more than 100,000 copies) and topped that year's Svensktoppen.

The biggest hit of her career was the song "Lyckliga gatan" ("Happy Street"), which was released in 1967 and was certified gold in Sweden and platinum and diamond in Norway.

Löfgren participated in Melodifestivalen in 1963 (with "Säg varför") and in 1968 (with "Jag vill tro").

[1] Her second husband was pianist Arne William Benny Löf, father of murder victim Erika Lööf.