As an adult, she taught singing at Kviteseid Seminar, one of the first public teacher's college in Norway.
By one account, she responded to the call for citizens to collect disappearing vestiges of Norwegian folk balladry.
These first appeared in Samling AF Sange, Folkeviser Og Stev I Norske Almuedialekter, the folklore collection of Jørgen Moe first published 1840.
The contribution by Olea Crøger as pioneer collector of folk ballad and melody had been underappreciated until the 20th century.
[8] When Crøger engaged in the ballad collecting, she intended her own name to appear as co-contributor to the work, but Landstad merely acknowledged her in the preface.