She is the wife of Signore in the Gosick franchise.
Jacqueline de Signore, who is created by Hinata Takeda, has no information regarding any inspiration used to create her. She first appears in Gosick episode 10. Her Japanese voice actress is Satsuki Yukino.
She appears after the Jiantan incident (the incident involves trafficking of children and auction of stolen art). According to Luigi, she is the one who sent him to boarding school.