[5] After leaving the Home Industries School, Bergerson was sent by the Norwegian government to Bilbao, Spain, for 18 months to teach weaving.

In 1932 she moved to England and worked for the Rural Industries Bureau, travelling the country advising handweavers.

[14][15] She married Englishman Archie Hay-Edie (1904–1994) on 22 October 1938 at St John's, Windermere, Cumbria.

[23] She initially installed a loom in her house, founding Mourne Industries, her intention being to establish a design studio.

However she couldn't find sufficiently skilled craftworkers to make her creations so she moved into larger premises at Killowen, Rostrevor and began to train local women to work the looms, using Irish yarns from Donegal.

[27] In the early 1950s Robin Day wrote to Hay-Edie, “Of all the rugs which I have seen, only yours have got the character enough as a background for my new designs of furniture to be exhibited at La Triennale de Milano 1951…”[28][29] Her rugs were exhibited alongside Day's furniture at the 1951 Milan Trienniale, earning her a silver medal and diploma.

[33] In 1956 she won the bid to provide fabric for London Airport, her largest order to date.

[35] In 1966 Hay-Edie “walked into the Liberty store and, without an appointment, convinced the buyer for the textile department to take orders of her fabric designs.”[36] During Hey-Edie's career, she also worked with the House of Lachasse and Hardy Amies.

[37] In the late 1970s much of Europe's textile production moved to Asia and Hay-Edie gradually had to let her weavers go.