How to avoid making jokes when encountering homophones?

There is a teacher's mother and a demon niece at home. My niece doesn't like to eat. Every time she coaxes her, she is coaxed to eat by her mother.

Mom: Come on, have another bowl of rice and go out to play.

Niece: I'm full, no more.

Mom: Then let's have soup and rice. It is delicious.

Niece: I'm full, no more.

Mom: Then let's not eat. Let's have soup.

Niece: I don't want soup!

Mom: Then let's just eat without soup.

Niece: OK.