Final answer:
DeeDee, who has a supportive relationship with her father, is likely to mature last due to the positive impact of a healthy parent-child relationship on adolescent development and maturity.
Step-by-step explanation:
Based on research that suggests family relationships are related to the timing of sexual maturation, one would predict that DeeDee, who has a close, supportive relationship with her father, would mature last. Research highlights that warm and healthy parent-child relationships are associated with positive outcomes for children, and girls with strong connections with their parents often exhibit more responsibility and maturity. Moreover, familial stability and parental involvement, particularly from same-gender parents post-divorce, have shown to lead to a more secure and gradual developmental process for adolescents.