Killing machine

A sadistic teacher discovers one of his teenage students is a prostitute and blackmails her into becoming his sex slave. When she becomes pregnant, he arranges her demise. His henchmen (who are kind of like the Three Stooges) murder her and chop her up. At this point a mysterious, sunglasses-wearing Dr. Frankenstein-like character intervenes and rebuilds the remains into a cyborg (with the aid of a sewing machine). Now robotically revived, her memory comes back from a shock she had from her chest injury during a fight, and she sets out to avenge herself, going after the teacher and the three henchmen who committed the murder.