The following is excerpted from the eNotes "Themes" pages on Sebold's novel. In addition to the themes you mention here, there is also analysis of other major themes which include "life and death" and "coming of age" as well as a number of others. You can read more by visiting the link below.
"Loss of a loved one and the stages of mourning or grief manifest as overriding themes in The Lovely Bones. Through the voice of Susie Salmon, the fourteen-year-old narrator of the novel, readers get an in-depth look at the grieving process. Susie focuses more on the aftermath and effects of her murder and rape on her family rather than on the event itself. She watches her parents and sister move through the five stages of grief: denial, anger, bargaining, depression, and acceptance. However, Alice Sebold makes clear that these categories do not necessarily remain rigid and that individuals deal with grief in various ways. For example, Abigail, Susie's mother, withdraws from her living children, Lindsey and Buckley, whereas Jack, her husband, draws closer to them. Lindsey, Susie's sister, vacillates between denial and acceptance, sometimes exhibiting both elements simultaneously. In addition, Sebold expands the definitions of both loss and grief by including Susie herself in the process. If readers limit their understanding of grief to losing and coping with the death of a loved one, then they have trouble accounting for Susie's emotions. She mourns her own death and the missed opportunity of getting to grow up, but more significantly, Susie grieves over the loss of living people. In other words, the novel extends the grieving process to include the dead themselves.
By including Susie in this process and having Abigail leave the family, Sebold investigates the nature of loss and its relationship to grief. The novel suggests change equals loss, which in turn initiates grief. While Susie's death emerges as the most blatant change in the lives of the Salmons, other significant changes also occur. Lindsey changes from adolescent to adult; Buckley changes from child to adolescent; Jack changes from a man secure in his place in the family to one questioning his ability to hold the family together; and Abigail changes from a woman questioning her position as wife and mother to one who redefines and then embraces that position. While each of these changes generates a sense of loss, ultimately each character moves on from the loss and grief. In The Lovely Bones, both the living and dead learn letting go opens up possibilities."