It was Mia & River's first meeting, but it seemed to be friendship at first sight- at least for Mia... River's a little worried about holding hands this early in the game. Perhaps Mia was was being too friendly.
Just imagine River and Mia 80 years from now in Lazy-Boys instead of Graco Snug-Rides Mia must have been upset about saying good-bye. Logan, please decide to go to law school and move your family to Spokane. Thanks.