First real supporting role (which?), in Madly (aka. The Love Mates) by Roger Kahane, with Alain Delon, who is a friend of Bardot (released 1970-12-18 France).

At the set of Madly with
Alain Delon in 1970

Role of Sarah in Les jambes en l'air (aka. César Grandblaise) by Jean Dewever (released 1971-5-13 Italy, 1971 France).

As Sarah in Les jambes en l’air, 1971