Jennet Device was always the odd one out but her family they performed witchcraft. And one day they got into an argument with the other witch family and exposed each other and as a result, both families went to court. but Jennet Device was used as evidence after staying with Roger Nowell.
Roger Nowell gave Jennet Device something she never got from her family (love) so she respected Roger Nowell.
When Jennet Device stayed at Roger Nowel's house he made Jennet Device rehearse a speech to say at court to confess that her family performed witchcraft. as a result, they got sent to the dungeon and were waiting to be hanged