Unless these children were in immediate danger of death, this woman had no right to baptize these children without the knowledge and consent of their parents. Now that it’s been done, the parents need to know what happened. Should they ever decide to baptize their children, or should the children ever decide to be baptized, it needs to be known that a baptism was already performed. Assuming this woman performed the baptism correctly, then any unconditional rebaptism would be objective sacrilege. Knowledge that an illicit baptism was already performed would let the baptismal presider know that what is needed is a conditional baptism.
If these were indeed illicit baptisms, because they were done for children not in danger of death and without parental consent, then I can only recommend that a suggestion be made to this woman that she seriously consider confession, both sacramental confession and confession to the parents.
In any event, the parents need to know of the baptisms. If this woman cannot bring herself to confess to the parents, then a trusted mediator such as a priest – one to whom she has not made a sacramental confession of this matter – could be asked to contact the parents on her behalf. That priest could let the parents know that someone who prefers to remain anonymous let the priest know that the children had been baptized and asked the priest to relay that information to the parents.
