Kicking a bridesmaid out the day before the wedding

Hey all-
I’m posting this because I honestly want to know if I was at fault in the situation or the bride was.

About a year ago, my best college friend and roommate asked me to be one of her bridesmaids, so I happily accepted. As the semester progressed, she slowly grew more distant from me. No singular event happened to cause this, and when I reached out to her to see what was wrong, she insisted she was fine. Things clearly were NOT fine, though, as she slowly talked to me less and less until after graduation we didn’t speak until the week before the wedding. I guess she just didn’t want to be friends anymore. Anyway, she never told me to leave the wedding party, so I assumed it was still on and drove the 9 hours to her city a few days before the ceremony.
Her bachelorette party consisted of two things: going out for dinner and then heading back to her house to get drunk. I confided in the brides sister (a good friend of mine) that I didn’t think getting drunk was very appropriate (for religious purposes), and she heartily agreed, since their family is of the same religion as me. I stayed for the dinner but then left afterwards. I guess another bridesmaid overheard me and the sister’s discussion and told the bride, because the afternoon of the wedding, the bride had one of her family members call me to say 1. The bride was furious at my behavior and disapproval of their plans and 2. There was no need to come to the wedding the next day.
After traveling the 9 hours to get there, and getting a non-returnable bridesmaid dress, not to mention trying to reach out to the bride with no response, I was pretty upset. I’ve just left things as they are with hopes that things will get better as she cools off, but I need to know- was I at fault, or her? If I have a responsibility to apologize I certainly will, but I really feel like I had a right to my religious persuasions (which are shared by her) and opinions. I think I just need some good wisdom here. What does everyone think?