I know this woman personally, as she was my art teacher in high school.
I do not even see why she went up for Communion in the first place.
Not just because of the grave sin, but this woman is BUDDHIST.
I know her story. She was baptized Catholic, but I don’t recall her saying that she received the Blessed Sacrament of Confirmation. I do remember her saying that she got into many spats with her parish priest as a teenager. She turned away from the Roman Catholic faith at an early age. She knows all the precepts. Especially the one where non-Catholics cannot receive Communion. And yet she goes up there, conscious of grave sin. The priest should have talked to her privately, but since she knows these things and is not a Catholic, I don’t see why she went up in the first place.