[1] She was born in Denmark to the Icelandic official Grímur Jónsson (1785-1849) and the Dane Birgitte Cecile Breum (1792–1853).
She was raised in Iceland but lived in Denmark in 1833–1846, where she was given a good education.
In 1859 she married the Icelandic official and politician Páll Melsteð.
She was active in the struggle to establish a permanent school for girls in Iceland.
She organized a campaign and collected money for the purpose.