Her obituary in the { New York Times } has a bit more information on her.
Nina Leen for LIFE magazine
Image credits: 1.} Beach Fashions, 1950, 2.} 1949 via Sunday Morning, 3.} Roosevelt Raceway, 1958 via My Vintage Vogue, 4.} Conversation Skirts via Playfast, 5.} Vintage capelet, 1950 via My Vintage Vogue, 6.} Woman Showing Her Fashionable Hairstyle poster print via Amazon, 7.} 1950 by Nina Leen via Elena-Lu
Photo of Nina Leen via LIFE.com