What metaphors are used in White Oleander by Janet Fitch?

Astrid has a very difficult situation. However, people get into much worse trouble and survive. Astrid’s main enemy is not a killer, who is waiting for her behind the house. “Her real killer is desperation.” She needs to be ready for fight at any moment, to hold hope in her hands, sheltering from the wind like the last match during a long polar night. Astrid should hide from despair. She should hide behind courage and bravery, because she cannot overcome despair, killing it with a weapon or a knife. Astrid has to fight with the help of emotions such as determination and courage.