I haven't seen anything indicating this is a done deal, only that Trump intends to nominate her. She wouldn't be my first choice either.

One of the problems with Catholicism (and I am Catholic) is the whole pesky repentance/forgiveness thing. We're not allowed to shun or devalue sinners (Dang it!).

Another problem is the concept that we are more than the sum of our parts, that our abilities and skills are not defined only by our past, that we are capable of extreme growth and change. We see it all through the New Testament. Jesus chose fishermen, rebels, adulterers, Semaritians, tax collectors and other sinners to go and create a global community (without Facebook!) and they did. Any list of Catholic Saints is full of sinners who turned their lives around and changed their corner of the world for the better. MIght Calista Gingrich be able or inclined to do the same? 

As I said, she isn't my choice either, but she might be accepted for reasons beyond her sins.