What were Hanna's first words, and why did she decide it was time to speak?

After her mother remarried, Hanna felt that her mother just wanted to get rid of her, so that she could clean their beautiful house all day and have Alex to herself. She decided it was time to act. She knocked on the bathroom door and whispered “I’m not Hanna” (38) in the voice of Marie-Anne, a French witch she had read about online. Her mother did not react, but at dinner she told Alex. He was thrilled, until she told him what Hanna had said.