In the eve of the burning of the Maresidian, and the disbanding of the clans, Shadow is given the task of acting as ambassador to Equestria's newest citizen, and the transport of one of their young, and after a few days rest at the hold, guarding the human liasons as they walk to Canterlot. Needing some time away from a soldiers life, and a few days with her daughter, she accepts.
Five minutes later, the human foal calls her "Grandma." Its gonna be a long trip...