Ring of Darkness(1979)

Original title: Un ombra nell'ombra

Once a Satanist who surrendered her soul and body to the devil himself, Carlotta Rhodes begins to regret her tryst with Lucifer when her teenage daughter, Daria, starts showing the evil influence of dear old Dad. Convinced that she can stop the devil's power on earth, Carlotta calls upon an exorcist for help.