Final answer:
Elena learned that building a family and a successful relationship doesn't have to conform to societal norms; she and Cam thrived without marriage and chose to become parents through adoption.
Step-by-step explanation:
Based on the various narratives provided, Elena learned from her experiences that life can take unexpected paths. Her life with Cam evolved in ways that didn't strictly adhere to societal or familial expectations of marriage and starting a family. Instead, she found herself focusing on her career and co-founding a nonprofit, which later influenced her decision to become a mother through adoption. Their relationship thrived without the need for marriage, showcasing that there are many ways to build a family and a life together.