Read the following text and answer the question.

Snow White

    Once upon a time, there lived a little girl named Snow White. She lived with her Aunt and Uncle because her parents were dead.

    One day she heard her Uncle and Aunt talking about leaving Snow White in the cattle because they both wanted to go to America and they didn't have enough money to take Snow White. Snow White did not want her Uncle and Aunt to do this so she decided it would be best if she ran away. The next morning, she ran away from home when her Aunt and Uncle were having breakfast. She ran away into the woods. She was very tired and hungry.

    Then she saw this little cottage. She knocked but no one answered so she went inside and fell asleep.

    Meanwhile, the seven dwarfs were coming home from work. They went inside. There they found Snow White sleeping. Then Snow White woke up. She saw the dwarfs.

    The dwarfs said, What is your name? I am Snow White, she said. The dwarfs said, If you wish, you may live here with us. Snow White said, Oh, I could? Than you. Then Snow White told the dwarfs the whole story and Snow White and the seven dwarfs lived happily ever after.

Why did her uncle and aunt want to leave Snow white in the cattle?