- For six years she was a producer and and director of both grand and light operas for the Redlands (California) Bowl.
- Had three children from her marriage to actor Henry Wilcoxon: Wendy, Heather and Cecilia. Cecilia was named after Cecilia de Mille, the daughter of director Cecil B. DeMille, with whom Henry was a close associate.
- According to Laura Wagner's article on Joan in Film of the Golden Ages, Spring 2015 issue, Joan was considered a child prodigy. At three she was performing in concert. At six she was fluent in two languages; was an excellent child horsewoman; and danced and played the piano.
- She was the great-niece of the founder of Woodbury Soap.
- She and her second husband, actor Ray Mitchell co-founded the Valley Players Guild Theatre in Palm Springs, California.
- Occasionally wrote magazine and newspaper articles for her local Palm Springs (CA) area.
- Suffered from tuberculosis when she died in Desert Hot Springs.
- Appeared in her first film at age 6 in The Half Breed (1922) starring Wheeler Oakman. Her first professional lead was in the Hopalong Cassidy western The Eagle's Brood (1935) billed as "Nana Martinez".
- Father Elmer owned a hotel; mother Joan Hedenfeldt, a one-time vaudevillian, was a Pasadena Tournament of Roses Queen of 1907. Her parents divorced when Joan was 10. Following this Joan's mother entered her daughter into a convent and pursued a European operatic career for several years before returning.
- Was chosen to be premiere ballerina for the Corps de Ballet's Opera Under the Stars at the Hollywood Bowl Grand Opera Festibval in 1936.
- Opened a dance school in 1944. Jennifer Jones became a student.
- An artist, photographer and photo collector, she later had special exhibitions of her art work. In 1963 she hosted a local series "Adventure in Art" on KCHU-TV.
- Later taught workshops at UC and also produced, directed and acted in the annual Nativity play for the Wilcoxon Group Players.
- Her mother was the third queen of the Rose Parade.
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