1.) (Fictitious character) In Sense and Sensibility by Jane Austen, Mrs. Jennings is a widow and the mother of Lady Middleton and Charlotte Palmer. She spends her time visiting her daughters and their families, especially the Middletons, and takes a great interest in the romantic affairs of the young people. She is meddling and a bit insensitive, but basically a kindly, cheerful woman.
2.) (Fictitious character) In Brighton Honeymoon by Sheri Cobb South, Mrs. Jennings was the considerably-less-charitable wife, now widow, of Vicar Jennings who insisted upon raising Polly Hampton after her mother's death.
3.)(Fictitious character) In All the Lovely Bad Ones, Mrs Jennings is a woman staying with her husband at a Vermont inn that is supposed to be haunted. They are both anxious to see a ghost.
4.)(Fictitious character) In A Horse Called Mystery by Marjorie Reynolds, Mrs. Jennings is the mother of the main character William "Owlie" Jennings.