Tom: Betty didn't win the beauty contest.
Mary: She would have had she had some talent.
It is an alternative expression to the standard conditional sentence. htm If she (had) had some talent, she would have won. Had instead of if Had she had some talent, she would have won.
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It is an alternative expression to the standard conditional sentence. There are several ways to avoid "if."
https://www.englisch-hilfen.de/en/grammar/replacing_if.htm
If she (had) had some talent, she would have won.
Had instead of if
Had she