During the discussions of 1856 which preceded the votes of articles ranging to integrate the new Constitution of the Government, women met first in Mexico a political Assembly role to express its position by representations read and commended by members. Women mobilized justified its action through two ways: by the prestigious surname that demonstrated their integration within a lineage and not as individuals, and by the mediation of the conservative members which led his letters to the Assembly. If this mobilization and this space of expression will be explored in our work, the rejection of this female participation in politics by the Liberals with an analysis of the liberal speech tended to discredit women as political actors and to affirm its traditional role in the private space will also be studied.