The okasan of the okiya may adopt one of the geisha as her daughter (musume), to be her heir (atotori), therefore the girl lives in the okiya and all of the money she earns goes to the okiya.
The okasan of the okiya may adopt one of the geisha as her daughter (musume). This is to be her heir (atotori). Therefore the girl lives in the okiya. All of the money goes to the okiya. She earns the money.