When I was young I saw this soft science fiction film (50s? 60s? 70s?) where a guy from Earth was helping some woman from another planet. I think it was set in Europe. One thing I remember is that the woman had a slightly elongated head.

Someone was after her I think and toward the end she disappeared-- then years later the man is introduced to a little girl who looks just like her, head and all. The assumption is that the earth man and alien woman were genetically compatible, and the girl was their daughter.

Anyway I have tried for decades to find out what that movie was. Maybe someone here has seen it?