Reference for Ketubot 200:26

ממאנת לא פסלה מן האחין ולא פסלה מן הכהונה יוצאה בגט פסלה מן האחין ופסלה מן הכהונה

[A minor] who exercises the right of refusal is not disqualified from marrying the brothers [of her husband], nor is she thereby disqualified from marrying a priest, but [a minor who] is released by a get is disqualified from marrying the brothers [of her husband] and also from marrying a priest;

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