Ingeborg i Mjärhult belonged to the peasantry of the parish of Virestad in Kronoberg County in Småland.
Her medical activity included a type of religious natural philosophy, which she also shared with the public.
Reportedly, she adjusted herself to follow all the church duties the law demanded and was in fact described as quite devout.
Ingeborg responded that she only used bandages prepared with herbs plucked at midsummer moon as she had learned from her mother, and that she did not harm anyone.
Her theory and practice were as follows: She believed that the entourage of Lucifer had been cast out unto the earth, were some had been given their dwelling in the water and were known as necks, under houses with the name of tomtegubbar, in plants and trees such as fairies, in forests such as Rå.
She believed that when people walked and their antipodes under earth happen to disturb the home of an vätt, elf, rå or similar creature below the earth, the human below earth would be wounded, and the human above would subsequently suffer thereby [...] when someone was ill, the patient need not be seen by her, nor did she need to ask their constitution, temperament, pulse, symptoms or diet, but it was enough if she was shown their sock, garter, linen or any textile worn by the patient, by which she could diagnose the illness and recommend a cure.