The Price of Silence by Camilla Trinchieri

Emma Perotti is an ESL teacher at Columbia University. Her marriage is suffering, even years after she accidentally ran over her young daughter with her car. When she meets a young female student, An-ling, she feels an immediate kinship that her husband Tom cannot understand. Emma finds herself mothering An-ling, then she leaves Tom and her teenage son, Josh, to move in with her. As we learn at the beginning of the novel, Emma is on trial for An-ling's murder. The book interperses chapters about the women's friendship with the ongoing trial. Did Emma kill An-ling or was it someone else?