- Participated in the 1949 Miss America pageant as Miss Washington, D.C.
- Was a gifted concert pianist.
- Roger Corman says in his introduction to the DVD version of Last Woman on Earth (1960), that he first considered Allison for the title role in this film. He, instead, cast Betsy Jones-Moreland, after seeing her in a play in Hollywood.
- In 1955, soon after she arrived in Hollywood, her agent wanted to get her an interview with Cecil B. DeMille. He took her to lunch on the Paramount lot, and the great director noticed her. She resembled the drawing he had made of "Sephorah", the wife of "Moses", in The Ten Commandments (1956). DeMille asked her to come to his office. There, under orders from her agent, she didn't mention that she was under contract to Universal-International. DeMille had her working on a scene with Henry Wilcoxon. When DeMille was informed that Allison was a U-I employee, he threw her and her agent off the lot.
- Best remembered for her role as Nancy Archer in the cult classic Attack of the 50 Foot Woman (1958).
- Miss Dixie of 1951.
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