I guess when you treat a potential convert like horsh** they have to question whether you are really Christian, and whether they want to join your church.
This started with her Catholic wedding being held in private in the sacristy because as an infidel she was not allowed to stand on the holy ground of the altar.
Would ultimately not let her be buried with her Catholic husband either.
In fairness the Catholic Church has come a long way in that regard since her day. They even play Away in a Manger in Catholic churches at Christmastime now.
Why would she raise her kids in a church she did not want to join? It was good enough for them, but not for her?