Jenny is the person who moved into Sam and Dean's old family home.
Mother of Sari and Ritchie and a widow. She has moved from Wichita to Lawrence to start a new life. Then her new house starts acting up and strange things happen. She gets freaked when her son mysteriously gets locked in the fridge.
Then Sam and Dean show up with some help. They help exorcise the spirits in the house. When Jenny returns, she finds her house in a mess, but now spirit free. Later that night, her bed begins shaking and gets locked in her room. Its Dean who comes to save her, and Sam gets her kids. Once the spirit is gone, she gives back their old family stuff and tells them they can come back anytime.