What are the motifs in The Other Side of Dark by Joan Lowery Nixon?

In addition to fear, hatred is an emotion that Stacy feels repeatedly throughout this novel. When she learns of Mom's death, she is consumed by hatred for the unknown killer, needing to know who he is since she can remember that she knows him, though she cannot picture his face. Despite Dad's protests that she is not ready, Stacy insists on looking at mug - shots because she is determined to see Mom's killer brought to justice, hating the murderer for taking Mom away. Dad warns Stacy not to be consumed by hatred, but she only hates the murderer more when she realizes Dad has been forced to work a second job to pay for her medical bills. She also hates the unknown man with the gun because she is now in a world she does not want and is not ready for.