I need answers about Marie's mother the Indian woman on page 12

From the text:

Her name was Marie Little Soldier, and she was a Hunkpapa Sioux who originally came from the Fort Berthold Reservation in North Dakota. She was in her earlv twenties, and she came to our part of Montana when her mother married a Canadian who owned a bar in Bentrock. The bar, Frenchy's, was a dirty, run-down cowboy hangout at the edge of town. Among my friends the rumor was that Frenchy kept locked in his storeroom a fat old toothless Indian woman whom anyone could have sex with for two dollars. (One of my friends hinted that this was Marie's mother, but I knew that wasn't true. Marie's mother once came to our house, and she was a thin, shy woman barely five feet tall. She reminded me of a bird who wants to be brave in the presence of humans but finally fails.