If she had at all a husband. Literally, "if being she be to an husband." Septuagint, ἐὰν γενομένη γένηται ἀνδρί. Case second, of a married or betrothed woman. As far as the legal status of the woman was concerned, there was little difference under Jewish law whether she were married or only betrothed.
In either case she was accounted as belonging to her husband, with all that she had (cf. Deuteronomy 22:23, Deuteronomy 22:24; Matthew 1:19, Matthew 1:20). When she vowed. Rather, "and her vows be upon her."
Septuagint, καὶ αἱ εὐχαὶ αὐτῆς ἐπ αὐτῇ. The vows might have been made before her betrothal, and not disallowed by her father; yet upon her coming under the power of her husband he had an absolute right to dissolve the obligation of them; otherwise it is evident that he might suffer loss through an act of which he had no notice.
Or uttered ought out of her lips. Rather, "or the rash utterance of her lips." The word מִבְטָא, which is not found elsewhere (cf. Psalms 106:33), seems to have this meaning. Such a vow made by a young girl as would be disallowed by her husband when he knew of it would presumably be a "rash utterance."