I don’t fault her entirely. She wasn’t really raised Catholic (she was Baptized, and that was pretty much it) but she is much the reason I am. And that’s something we do need to remember when dealing with “former” Catholics, is they may legitimately be ignorant of what the Church teaches. I know some folks leave the Church for purely emotional reasons over intellectual ones. It is true that sometimes Catholics can be quite unwelcoming. That’s something I admit we should work on. Still, I don’t find that a convincing reason, but I am not them. Anyway, back to the OP, I think bringing Catholics back to the Church (well God does it through us), then knowing the Bible, not just bits and pieces, would be very helpful in situations such as these.