וד' יסלח לה כי הניא אביה אתה
The implication is that the girl sinned, and, as a result, she requires Hashem’s forgiveness; but if her father had revoked her nedarim, what prohibition did she transgress? This applies to a girl who was unaware that her nedarim had been revoked, and, despite being bound by neder (in her mind), she violated its terms. In actuality, she did not sin, but she certainly acted inappropriately, thus mandating for herself some form of repentance. Chazal compare this to one who meant to eat ham and instead ended up eating kosher meat. Technically, he did not sin, but his intention was…