I agree, she was treated unfairly. The church has a duty to keep all entrances safe, not just one or two... thus they were negligent in not making all available entries safe, as a reasonable and prudent person would expect them to be.
If they could see that there was even the possibility of danger it would be proper to post warnings (like "Caution Wet Floor" signs are required).
And yes, if it is determined it can not be made safe and warnings are insufficient, then the entrance should not be available for use by the public and should be clearly marked to that effect.
I guess my experience working with two PI's is popping out here, but we did work on many slip and fall cases.