Reference for Ketubot 191:8

וכן כי אתא רב דימי אמר מעשה בכלתו של ר' שבתי שתפסה דסקיא מלאה מעות ולא היה כח ביד חכמים להוציא מידה

So it was also taught: If a widow seized movable property [to provide] for her maintenance, what she has seized was seized. And so when R. Dimi came he said: It once happened that the daughter-in-law of R. Shabtai seized a bag full of money, and the Sages did not have the power to take it out of her possession.

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