It's wrong to take things from people that aren't yours.
Giselle's mom only buys regular wooden pencils for her to bring to school, and she sees her schoolmates with fancy mechanical pencils.
Giselle wants a mechanical pencil.
Giselle brings her allowance with her to the store and buys a mechanical pencil.
Giselle picks a mechanical pencil out of someone else's art box when they are not looking.
Giselle's mom is proud of her for the responsibility that she has shown.
Giselle's mom sees the pencil in her backpack and punishes her for stealing.