She even suggested that I come to her Church...
Yes, but I was friendly like that and said things I didn't think would happen. If they did happen I would wig out. This is just a shy timid girls perspective.
I think you need to take a breather from your thoughts. If you think of her say a Hail Mary. Then just watch and pray.
If she comes back to your church and approaches you, then think about her again, until then, please find a physical hobby. Buy some weights. Join a gym. Anything to stop the over analyzing. It is just going to make you crazy and insecure.