Non-virgin women are excluded from marital rites with its Agni-hotra, etc.
pāṇigrahaṇikā mantrāḥ kanyāsveva pratiṣṭhitāḥ |
nākanyāsu kva cinnṝṇāṃ luptadharmakriyā hi tāḥ || 226 ||
The marriage-ritual texts are applicable to virgins only, and nowhere among men, to non-virgins; and this because these latter are excluded from religious acts.—(Manusmṛiti-8.226)
i.e, the sacred rituals of marriage with its post marital Agni-hotra and other rites yields to naught with a non-virgin woman. Devatas seem to not accept/validate rituals carried out with them.
My question is are there any expiation involved for a non-virgin woman in order to reclaim the right of marital rituals? If yes, what's the procedure?
P.S: A non-virgin woman is actually already married with a man she sexually engaged with under gandharva-vivāha. Therefore, the question can probably be reframed as, Is there atonement for a married woman for marrying another man with rights of post-marital rituals provided she isn't living with her husband anymore?