She was born in Solna Municipality to Gunnar Karlsson and Elsa Sparring. Her greatest success was probably "Lyckliga gatan", a Swedish version of "Il ragazzo della via Gluck", performed by Anna-Lena Löfgren. She wrote the lyrics for "Judy, min vän", Swedish contribution to the Eurovision Song Contest 1969, and she wrote the lyrics for "Diggi-Loo Diggi-Ley", winner of the Eurovision Song Contest 1984. She was inducted into the in 2017.