In November 1635 (at the age of about 64 years), she was accused of witchcraft. She was arrested, examined and tortured. The mayor of Neuss accused her of having a deal with the devil. A few years back she already had the reputation of being a witch. In the wake of growing public rumours, the authorities were forced to do something. After hearings on November 15 and 22, Jonas denied the charges. On December 19 and 20 she was put on a chair spiked with sharp nails for three hours.