From ye-ye girls & Wikipedia:
Real name: Daniele Groule
Boyish and wild Dani, was born on October 1, 1945 in Castres, Tarn, France. Dani was meant to have been France's Eurovision Song Contest 1974 entry, but the President Georges Pompidou died in the week of the competition, so she never entered Eurovision properly. In cinema she has played in the last Antoine Doinel-Adventure Love on the Run a short-time-affair of Antoine, Christine's friend Liliane. In the late 70's she had drug problems (she wrote a book about that), then she came back to music with the help of Etienne Daho. In 1993 she recorded a great (and almost unknown) album with the Stranglers : 'N Comme Never Again'. She's now running a big flowers business 'Au nom de la Rose' in France.
Check these groovy Dani-songs. Want more?
Dani - Dring Dring
Dani - Sans Astérisque