She had a career as an melodramatic actress in the late 80s and early 90s while she was still trying to gain a foothold as a melodramatic singer. Here she is at 18, for example, in L’heure juste (1986).
The bathtub scene and the see-thru in Des fleurs sur la neige represented her only on-screen nudity. She was about 22 or 23 at the time it was lensed.
Here’s the bathtub scene with sound:
And here is the see-thru with sound: