Andreasen grew up in Vestmanna, as the daughter of Andreas Andreasen (1906–1974), a teacher, and Daniella Andreasen, a housewife. Early in her career she produced illustrations for collections of her father's poetry. From 1968 to 1970 she studied at a vocational school in Kerteminde in Denmark to become a teacher of embroidery. In 1974 she studied to become an occupational therapist in Hellerup.[2] In the 1970s she took a job as a therapist in Tórshavn hospital where she worked with mentally handicapped people, teaching them embroidery and other art forms.