Although Evan tries to manipulate Marigold, she now knows the truth about Evan’s past and poisons him to get revenge for the way he has treated her. Tilly poisons Evan to make him feel powerless and weak—the way that he has made her feel. The fact that she uses marigold water is pertinent because, while Evan uses traditional medicine to control and silence women, Tilly uses alternative, herbal medicine to empower Marigold and allow her to get back at her husband.