At the time she was crowned she was underage. She went on to place as a semi-finalist in Mission America and became widely known as a "tap dancer extraordinary" with shows in a number of famous venues including Broadway. Her lifelong interest in dance already showed by age 7, at which age the Miami News says she was "teaching playmates at 10 cents per lesson".
In order to compete in the Mission Florida pageant, girls were required to be at least 18 and were carefully screened for age, but there were 260 other girls in the contest and Magrill was able to complete the screening process without being asked her age.
The finals took place in Atlantic City in September 1939. At some time after the Mission America contest, Magrill lived in New York and became a Broadway dancer.
She was the cover girl for True Story magazine in October, 1939 - a major national magazine at the time. A November 2006 article in the South Florida Sun-Sentinel described her dance career:
" was called "tap dancer extraordinary" by newspapers in the 1930s.
She danced on Broadway and in the George White Scandals of 1939 and the Duke Ellington Review of 1943.
She danced in hotel venues and all the big clubs in the country, including the Martha Raye"s Five O"clock Club in Miami Beach. Her name was in lights on the marquee at the 500 Club in Atlantic City."
According to Broadwayworld.com her Broadway performances included dancing girl and performer roles for:
George White"s Scandals (1939)
A Connecticut Yankee (Broadway Revival, 1943)
Bright Lights of 1944 (Original Broadway Production, 1943)
She also performed with the June Taylor Dancers. As of 2006, Magrill was a dance instructor in Florida.