She needs to do nothing more than to ask God for forgiveness, to say The Lords Prayer as Christ told the masses on The Sermon on the Mount to do. From there she need only to find the nearest Catholic church in her area, ask the monsignor or a priest there to baptize her in the Name of The Lord and start attending Mass. She should also ask to hear her confession heard as well. It’s no big deal to become one with the True Faith and the true Church. We hate the sin and love the sinner. Our faith is about the love Christ preached, not castigating people because they’ve chosen a false path previously.
I think she’s heard the knock and is busy trying to avoid the door.
Pretty sure her conscience is getting to her. Catholicism is the easiest target, but I think we’ll be seeing Keira come about pretty soon.