The one major motion picture that Mary Sinclair acted in was Arrowhead  made in 1953, starring  Charlton Heston, Brian Keith and Katy Jurado,  with Jack Palance as an Apache chief, in which she played Lela Wilson.
Mary Sinclair starred in the 1953 movie Arrowhead, which included Charlton Heston, Brian Keith, and Katy Jurado, with Jack Palance as an Apache chief, where she played Lela Wilson.