Who is Mary Follet from A Death in the Family and what is their importance?

Mary Follet is Jay's wife. She is a devout Catholic, who prays for her husband's safety when he goes to his ailing father in the middle of the night and praying for God's mercy when she hears that he has been in an accident. Mary relies most heavily on her faith when she hears of her husband's death. Mary's controlled exterior, however, collapses when it comes time to plan the funeral.