In 1973, Alexandra appeared in the film Contes immoraux (Immoral Tales), an erotica film directed by Walerian Borowczyk, and Les Baiseuses which was titled Jailbait or That Girl Is a Tramp in the US. In 1976, Alexandra had a starring role in Une vraie jeune fille which was directed and written by Catherine Breillat. Alexandra played the role of a 14-year-old girl who goes through a turbulent sexual awakening. In English-speaking countries, the film was called A Real Young Girl in the US and A Real Young Lady in the UK. The film was not released until 1999 due to its graphic depiction of sexuality, including explicit close-ups of Alexandra's genitalia.
In 1976, she also appeared in the film L'Acrobate, a comedy-drama directed by Jean-Daniel Pollet. In 1977, she appeared in Goodbye Emmanuelle and The Strange Case of the End of Civilization as We Know It, and her later films included Spookies and Personal Services under the name Charlotte Seeley.