2,819. A Remarried Divorcée's Vows

Hilchos Nedarim 11:12

Counter to the previous halacha (which dealt with a betrothed maiden), let’s say that a married woman took a vow, which her husband didn’t annul. If he divorces her and remarries her on that same day, he can’t annul that vow because she entered her own independent domain after making it. Even though she made the vow in his domain and she is again in his domain, since she entered her own domain in the interim, her vow stands.

Hilchos Nedarim 11:13

Let’s say that a betrothed naarah made a vow that was heard by neither her father nor her fiancé. She is divorced by her fiancé and then betrothed to someone else. If her father and her current fiancé learn of her vow even several days later, they can annul it since the first fiancé hadn’t heard it.