In 1920, her first book, "Når elv skifter leie", was published. It was well received by the contemporary author Ingeborg herself rated the best: Hans E. Kinck. He wrote in the newspaper "Tidens Tegn":
"In her art, she is always present, always in good faith (...) Regarding her choice of subject, her view seems thoroughly healthy, with a great humanity (...) a young and unusually warm spirit and sense of humour".
Afterwards, her books appeared regularly till the war broke out. They are marked by a concise, condensed language, and unusually rich and graphic vocabulary. The early short stories and novels may seem gloomy, with the deep forests of Eastern Norway as a backdrop and intense, sometimes violent action. But they also contain small, light nature sketches, pointing towards her later poems.
Pre-war books: