Nancy put her own interests of wanting the shoes above the interests of Vicki' interests. Nancy wanted the shoes enough to steal the shoes from Vicki and Nancy's interests were accomplished. The Principle of Utility again Nancy is in the right. In this situation both Nancy and vicki came out happy. Respect, this category of value Nancy lost.
Respect is in part honesty.
Nancy was not completely honest in this situation. Although she did not lie, she did steal and stealing is a form of dishonesty.