She began acting, singing, and dancing as a child in minor stage productions in Sweden[1] She moved to London at the age of fifteen to pursue her career.

[2] In 2013, Agneson made her UK stage debut in titular role of a Cinderella pantomime at the Exeter Corn Exchange.

[6] Agneson made her television debut when she was cast at age 19 in the fifth season of the History Channel drama Vikings as slave turned Queen Freydis, initially a guest appearance before being invited back to recur.

[11] Agneson helped her friend, who runs an organisation, distribute aid to those affected by the Russian invasion of Ukraine.

[12] Agneson works with Hope for Justice,[13] a charity that aids survivors of human trafficking and modern slavery.