Born on November 29, 1930 in Chicago, Illinois to Herbert and Caryenne Wickman, Allyn -whose name means "precious"- was raised in Texas and Indiana, graduating from Reitz High School in 1948. She settled in California where she began a modeling career for swimwear and fashion. She never won beauty titles, but was a finalist in such pageants as Pan-Am Queen of 1946 and Queen of the Home Show of 1955. She modeled makeup for Max Factor and Indian imports between pageants. An unusual gig was when she modeled for Falls City Brewing Co. endorsing their beer. Unlike a lot of her peers, Allyn's modeling career lasted into her 30's as she maintained her flawless face and shapely figure.

Although she had no ambitions for acting, she had walk-on roles in The Buccaneer (1958) and A New Kind of Love (1963), and appeared in a stage production of June Mad as Julie Harris. She married Roy Dimitri Parsons, a British-American painter, sculptor and Veteran. After two international tours promoting swimwear for Rose Marie Reid Co. that included destinations like Australia and Europe, she retired from modeling to support her husband's ventures. She died in 2019 in Dallas, Texas, predeceased by her husband and son Kiran Ravi Parsons.