What are the motifs in Key of Valor by Nora Roberts?

Friendship is a relatively new concept for Zoe. Over the past two months, she has developed very strong friendships with Dana and Malory. The friendships stem from the women's work together as a triad to free the Daughters of Glass. It would seem that the women's connection as sisters has translated to the present moment. Working together to retrieve the keys means that the women have had to rely on each other's skills, knowledge, and instincts. As a result of the friendship, the women have decided to open a business together.