Do you mean that the actual sentence you heard is "Girls smart on their looks"? That doesn't make any sense to me. If not, what is the actual sentence you've heard used (or a typical example sentence)?
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unprlldShe looks smart.Hi unprlld. If you're replying to me, I'm sorry, I failed to decipher your original question, thinking it was more complicated than it actually was. I agree with the other posters. It's fine to say a girl looks "smart" if you mean well-dressed, neat and tidy, that kind of thing.