google always tell the truth

Eight-year-old Nina brought her report card home from school. Her marks were good...mostly A's and a couple of B's.

However, her teacher had written across the bottom: "Nina is a
smart little girl, but she has one fault. She talks too much in school.
I have an idea I am going to try, which I think may break her of the
habit."

Nina's dad signed her report card, putting a note on the back:
"Please let me know if your idea works on Nina because I would like to
try it out on her mother."