Ingrid Schoeller
 

German film actress, but her career was based entirely in Italy (IMDb page).

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Picture review of Tiempos de Chicago (IMDb link) from Take 5.

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Girl illustrated no 8

I Maniaci (foreign version) - 1964.
 

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Kent (Italy), March 1967

Ingrid Shoeller
 

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Escort, December 1966

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slightly better

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"Cinémonde" n°1695, May 30 1967.

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"Ciné Revue" n°26, June 25 1964.

Betty Clark
 

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Betty Clark? Ici, le paradise? You draw a blank with these on IMDb, but clearly, this is our Ingrid in Tiempos de Chicago. (From a French book called Le petit livre rouge de La Revolution Sexuelle Au Cinema.)