She expressed no sorrow at her sister's death and explained it as something about evil and her sister's lifestyle.
The younger detective said something to Friday and he said, as a throwaway line, "She's one of those born agains". This is a paraphrase as I was not really paying close attention to this totally unnecessary part of the story.
The impression given was one of dissapproval.
It was an absolutely meaningless addition to the plot; except that someone wanted to get a bit of propaganda in there and they did!