Matthew Poole and continuators on Numbers 30:9

9 But every vow of a widow, and of her that is divorced , wherewith they have bound their souls, shall stand against her.

Though she be in her Fathers house, whether such persons oft returned: which limitation may be gathered both from the opposition of her being in her Husbands house, v. 10. and from hence, that this was the onely doubtful case▪ for if such a person was not in her Father's house, she was unquestionably bound by it, but being now freed from her Husband, and returned to her Father, it was doubtful whether she was not returned to the same state of subiection in which she was before, and consequently unable to make or perform a vow without her Fathers consent, as she was before, which is here denyed.