My situation was exactly like your bride's, right down to me not being a practicing Catholic. I was pressured and succumbed to my parent's wishes, but we had to jump through hoops to get there. Because we were not parishioners of a church, the local catholic churches would not marry us. One priest said "Think of the church as a club house, if you do not pay the dues, you cannot use the club house". Another priest told us that if we came to church every Sunday for a year, he would marry us. Yet another priest had the audacity to ask us if we had sex.
I told my parents, no way we were getting married in a church. They talked to their local Catholic church who agreed to marry us IF we took some Pre Cana classes. We jumped through those hoops to please my parents. It was not until the wedding day when we were actually in the midst of the wedding ceremony that we were asked to promise to raise our children in the Catholic faith. OMG, I had 130 people there behind me and we just muddled through that part of the ceremony. I felt like crap but what was I supposed to do, run out of the church?
That was in 1981. Never, not once did my parents or any other person even care or mention whether or not we went to church or raised our children Catholic. No one cared, not even my parents.
It is a show when it is demanded that a religious ceremony is a must, or else.
Her parents are hypocrites to expect THEIR non practicing Catholic daughter to get married in a church. It is meaningless and they know it, but they have to keep up appearances.