Too Much Talking

Eight-year-old Sally 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:

"Sally 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."

Sally's dad signed her report card, putting a note on the back:

"Please let me know if your idea works on Sally.
Because

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I would like to try it out on her mother."