Bava Metzia 18A

מאי ״גובה את הכל״? מנה ומאתים הוא דאית לה.

then what is meant by the wording: She collects all that she is entitled to? What she has is only the main sum of the marriage contract of 100 or 200 dinars that she can collect. Clearly, the Mishnah is referring to a case where the husband wrote a marriage contract, and it does not indicate that a betrothed widow receives payment of her marriage contract.

ואלא, מדתני רב חייא בר אמי: אשתו ארוסה, לא אונן ולא מטמא לה, וכן היא לא אוננת ולא מטמאה לו. מתה ⁠– אינו יורשה, מת הוא ⁠– גובה כתובתה.

And if one would say that the marriage contract of a betrothed woman is instead derived from that which Rav Ḥiyya bar Ami teaches, that is also difficult. He teaches: One does not enter acute mourning on the day of the death of his betrothed wife, nor may he become ritually impure at her funeral if she dies, if he is a priest; and similarly, she does not enter acute mourning for him if he dies, and she may not become ritually impure at his funeral. If she dies, he does not inherit her property. If he dies, she collects payment of her marriage contract.

דלמא דכתב לה, וכי תימא: דכתב לה, מאי למימרא? מתה אינו יורשה איצטריכא ליה.

If it is derived from here that a betrothed woman receives payment of a marriage contract, this is not proof, as perhaps this too is referring to a case where he wrote a marriage contract for her. And if you would say that if it is referring to a case where he wrote her a marriage contract, what is the purpose of stating this? One could answer that while this clause is obvious, it was necessary for Rav Ḥiyya bar Ami to state that conversely, if she dies, he does not inherit her property.