- She was born out of wedlock in Norway to a Finnish mother and had a German soldier for a father. The German army was occupying Norway at the time. Her father was later killed in combat. She was left, by her mother in an Oslo orphanage at the age of two months. In 1949 she was adopted by an American couple and grew up in the United States.
- She occasionally does nostalgia shows with Angela Cartwright.
- Was considered for the lead role in Lolita (1962), which eventually went to Sue Lyon.
- Her original American name was Martha, but upon embarking on an acting career she changed it to the more European-sounding "Marta".
- In 1964 she auditioned for the role of Liesl Von Trapp in The Sound of Music (1965).
- Stuntman Robert 'Buzz' Henry taught her how to ride for the movie Savage Sam (1963).
- Has a daughter, Lora Alison Treadwell who was born on November 11, 1969 in Los Angeles with her now ex-husband, Terry J. Treadwell, a psychologist.
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