By the time she was entering her teens, Boyhus knew she wanted to study history and her parents encouraged her choice.
In 1954, she matriculated in modern languages from Nykøbing Cathedral School [da] and began studying history at the University of Copenhagen.
[1] During her studies, she worked at the National Museum of Denmark from 1955 to 1961, serving on the editorial staff of the journal Danmarks Kirker (Danish Churches).
[2] While still a student, in 1963 Boyhus was hired to manage and serve as a museum inspector at the Lolland-Falsters Stiftsmuseum og Frilandsmuseet in Maribo.
Some of those exhibits examined life during the Occupation of Denmark in World War II and the production of sugar beets, including their agricultural importance, working conditions, and how those impacted women's lives.
Simultaneously, she served as a member of the Danish organization Rådet for Europæisk Politik (Council for European Politics) from 1993 to 1997.
[1][2] Some of her early works evaluated agricultural production on the islands of Lolland and Falster and the importance of sugar beets to the economy.