Related for Ketubot 194:15

A widow who claims her ketubah, but the inheritors [of her husband] say to her: "You received your ketubah [already]!"—until she is [re]married, they need to bring evidence that she received her ketubah; once she is [re]married, she needs to bring evidence that she did not receive her ketubah. If she sold her ketubah, used her ketubah as a pledge [for a loan that goes to the creditor in the meantime], used her ketubah as a security [on a loan but that remains with her]—she loses her financial support. Rabbi Shimon says: Even if she sold some [of her ketubah], even if she made some of it as a pledge or some of it as a deposit—she loses her financial support. One doesn't need to say [that this applies] after her husband's death, but even during her husband's lifetime [if she did these things to her ketubah, she would lose her right to financial support after his death]. But [her losing her financial support only applies if] she writes [in the contract dealing with her ketubah] "These I sold for my ketubah, these I sold for my financial support"—words of Rabbi Yehudah. Rabbi Yoseh says: [It applies only] if she sold and wrote without specification; that's why her legal power is stronger [that most of the time the inheritors have to bring the evidence].

Just as a widow can sell [her ketubah] without the court, so too can her inheritors [or] those who come with her permission sell [it] without the court. Said Rabbi Shimon: Why did they say that a widow can sell [it] without the court? In order to benefit the orphans, such that they shouldn't plunder their property [if they have to wait to go to court, they will be using up their property in the meantime, so they said that they don't need a court and can sell the ketubah immediately]. If she took possession of a field that was made a security [for her ketubah] and ate it [i.e. used up the value of the property], but profits came out of it—they evaluate for her what she ate, and evaluate for her the profits [just like someone who took possession of a field without permission]. If they evaluate for her in a court, whatever they evaluated is evaluated.