When I was a child in the North of England in the 1940’s / early 1950’s we went to the cinema on Saturday afternoons to see a children’s “Matinee”. The films were mostly American and always included cartoons and a serial.
One of these was called Nyoka and featured a woman as the central, heroic character. I remember she wore a scout shirt and shorts and had dark hair; she also had a boyfriend called Larry, who had a shooting brake. Their advcentures seemed to take place in Africa or Arabia.
I would love to have this on video or DVD. I can still visualiuse the titling. I found it frightening at the time but it is probably amusing in retrospect.