<p>mazati, I think the answer to your question is embedded in your question itself:</p>
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<p>Evidently your mother wasn’t trying to do the most “perfect” job of parenting (I don’t mean this in a bad way). Maybe your sister is like her own mother- not trying to turn in the most “perfect” homework assignment? </p>
<p>I wouldn’t change a thing- let the girl be herself. It is not always a good thing to be a perfectionist.</p>