“In Marriage, the non-Catholic party participates in the sacrament by virtue of the Catholic spouse.”
While it is true that marriage to a Catholic imparts no right to other Catholic sacraments, some further precision is useful here. The participation of a non Catholic baptized party in the sacrament when married to a Catholic is not derivative.
The valid marriage of two baptized non Catholics is a sacrament as well. The valid marriage of a Catholic and a non baptized person is not a sacrament. The valid marriage of a Catholic and a baptized person is a sacrament, and the parties share equally in the sacrament.
“Only in extreme (grave) circumstances may a non-Catholic . . .”
The conditions under which a baptized non Catholic may receive the sacrament of penance lawfully from a Catholic priest are set forth in canon 844. A non Catholic who is not baptized, even though a member of a non Catholic Christian ecclesial community, cannot receive the sacrament of penance validly.
Note the distinction between members of the separated Eastern Churches (and those in the same condition, as below) and of other Christian ecclesiastical communities.
Can. 844 §3. Catholic ministers administer the sacraments of penance, Eucharist, and anointing of the sick licitly to members of Eastern Churches which do not have full communion with the Catholic Church if they seek such on their own accord and are properly disposed. This is also valid for members of other Churches which in the judgment of the Apostolic See are in the same condition in regard to the sacraments as these Eastern Churches. §4. If the danger of death is present or if, in the judgment of the diocesan bishop or conference of bishops, some other grave necessity urges it, Catholic ministers administer these same sacraments licitly also to other Christians not having full communion with the Catholic Church, who cannot approach a minister of their own community and who seek such on their own accord, provided that they manifest Catholic faith in respect to these sacraments and are properly disposed. §5. For the cases mentioned in §§2, 3, and 4, the diocesan bishop or conference of bishops is not to issue general norms except after consultation at least with the local competent authority of the interested non-Catholic Church or community.
An individual assessment of each person who seeks the sacrament or his or her accord, in addition to the other conditions, is required.
Let us recall that the original post offers no specific details that would permit any speculation on the individual cases. We only know these women are not Catholic. We don’t know if any are baptized, and if so, whether they are members of Eastern Churches not in full communion, or members of other Christian ecclesial communities.
A blanket treatment of a group, however, seems wrong.
The difficulty in offering something like the sacrament, just a devotional retelling of sins and some counselling, while the Catholics are receiving the sacrament, is that it tends to confusion about what the sacrament is.