Lady Frankenstein 1971 Horror Film
From IMDb: When Dr. Frankenstein is killed by a monster he created, his daughter and his lab assistant Marshall continue his experiments. The two fall in love and attempt to transplant Marshall's brain into the muscular body of a retarded servant Stephen, in order to prolong the aging Marshall's life. Meanwhile, the first monster seeks revenge on the grave robbers who sold the body parts used in its creation to Dr. Frankenstein. Soon it comes after Marshall and the doctor's daughter.
Lady Frankenstein (Italian: La Figlia di Frankenstein) is a 1971 Italy horror film directed by Mel Welles. It stars Joseph Cotten, Rosalba Neri (under the pseudonym Sara Bey), Mickey Hargitay and Paul Müller (actor). The script was written by cult writer Edward di Lorenzo