The Swedish writer Selma Lagerlöf immortalised Ysätters-Kajsa in the first part of Chapter 24 of her famous novel The Wonderful Adventures of Nils (1906–1907).
She appeared to have lived in Asker parish, but she played jokes on people all over Närke and was unique to that region.
If it was winter and the snow allowed sleighs to move about, she could see many people traveling on the plain from this vantage point.
Then she would start a real storm and create snow drifts so high that people could hardly get home in the evening.
The colliers in Kilsbergen were afraid to go to sleep because as soon as she saw an unguarded charcoal kiln, she would sneak in and puff on the fire so that it would start burning brightly.
If the vicar's wife in Glanshammar had prepared afternoon coffee in her garden a Sunday in the summer and a breeze came up which lifted the table cloth and dumped the cups and plates on the ground, then everyone knew who was to blame.
Whenever she was sitting on the top of a cloud watching Närke, which lay under her with its affluence and wealth of prominent homesteads on the plain and rich mines and ironworks in the hills, with its turbid Svartån River, and saw the shallow lakes of the Närke plain that were so rich in fish, and looked over the old borough of Örebro surrounding a grave, old castle with its sturdy towers, she must have thought: "The people would be much too well off, if it were not for me.