As I said, a Christianization of the meal, celebrated as a family tradition under the auspices of Christ, as any Christian meal is, is harmless ; however, if she means her Jewish family’s ritualistic practice of the meal, than that would be a participation in the religious celebration of another religion, which Catholics are always forbidden to do, owing in no small part to the law of Lex orandi ; lex credendi, I imagine. This cannot be justified, furthermore, on the fact that many Jewish rituals, festivals, and celebrations were, at the time of Christ’s coming, participated in by Christ Himself and His Apostles, or at least had their origins in them, for He Himself is the interpreter and, as I said, even originator of these things. He has revealed to us their proper and true meaning, and fulfilled them, as promised, and hence the Apostles would perpetuate these practices in a Christian context ; that is, with the meaning Christ gave to them, which was their purpose. Thus I make recourse to the important distinction between things merely natural, and those things that are Supernatural, which are of infinite more value, owing to their being Eternal / Ever-lasting.
Pax Christi,
Tim