Susan Penhaligon dubbed by an American voice artist
They had an American voice artist dub her voice, by attempting Peruvian accent. It is blatantly obvious.
I doubt Penhaligon, who is British, was (and is) capable of attempting a Peruvian accent. Perhaps the reason she was dubbed.
An update: I just heard that there was another version of this film, with Susan actually dubbing herself in English. Yes, it's true! But the one on the 1979 Magnetic Video version, is not the one with Susan dubbing herself.