If the 4 guests illness progressed more slowly, was less severe in early days, didn’t attend hospital & talk, the link to EP would not be as quick or strong.
EP would have said - that one or two guests were already feeling a bit poorly at her lunch. Barely ate, etc. Erin could have controlled the whole narrative and no doubt offered medical alternatives and described fictional conversations about what made them sick. And like
@ch_13 says above - EP being well would prove their mystery illness had nothing to do either with her. She would blame church coffee or similar … EP would be so helpful, saying they left lunch early or hardly ate the BW she toiled over. She was ready to be helpful and full of fiction for that scenario …..
And, in the end, any talk of her cancer would be swept away as false positive or some mix up.
The church people all gone with mystery illness.