"They have identified several factors that could be contributing to an intensified mother-daughter symbiosis: technology that makes it easy to stay connected; the smaller number of children in each household; young adults who are prolonging decisions about career, marriage and children; parents who want to have a less-hierarchical relationship with their offspring; and parents who feel the need to keep their grown children close at a time when anxiety and depression levels among young adults are at some of their highest points ever."(Rosenbloom).
Researchers suggest that population and technology changes have made young adults have a closer relationship with their mothers for a longer period of time.
Whether the mother-daughter relationship is best friends, sisters, or clashing personalities, the changing dynamic is what keeps each relationship unique.