KB,
Marie Badichon Labadie is my 3x Grand Aunt. I am American and therefore not eligible for MNO status. I have however registered as Metis with the Communities of the Voyaguer Metis through my relationship to Marie's parents Antoine Badichon Labadie and Marie Sauvagesse. Contact Voyaguer Metis, they may be able to help you. They know and accept Marie as first Nation.
Good Luck - JMA