Reference for Ketubot 107:12

הני בין בבית דין בין שלא בבית דין תובעת בבית דין אין שלא בב"ד לא:

These [acts deprive her of her maintenance] whether she appeared at court or not, but the act of claiming [her ketubah deprives her of maintenance] only if she appeared in court but not if she did not appear at court.

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