Is she a hypocrite?

My boyfriend/fiancé invited one his close friends and his girlfriend to our upcoming wedding this summer. I just got their response RSVPing “no” to our wedding. When my fiancé asked his friend why they aren’t coming (because originally his friend was so excited and happy to hear about our engagement), he admitted that it was his girlfriend who didn’t want to come. So I got enough courage to ask her directly and she point-blank told me that she couldn’t come to our wedding because it conflicts with her religious beliefs. She elaborated that because it was my fiancé’s second marriage, her devout Roman Catholic beliefs don’t believe in divorce, etc. I was shocked because she and her boyfriend have a child, and aren’t married. So wouldn’t having children out of wedlock not be a conflict with her religion? Am I being too sensitive that they are not attending or is she a hypocrite?

EDIT: To make things a bit clearer, this girl was raised and brought up in an ultra-conservative, highly religious family. So her family disowned her for a few years after finding out she got pregnant. Their kid is now 6 years old and from what I know, the relationship with her and her parents are still rocky but on the mend.

Also, this was a close friend of my fiancé. They’ve known each other for 10+ years (well before he got together with his girlfriend). And the four of us hang out all the time, and they’ve invited us to their house for dinners, parties, etc. So the RSVP decline was not something we expected. We asked them about it (politely, non-confrontational). And the reason why he can’t come either is because of her- she will get really upset at him for attending on his own.