I'm afraid it does, specially when there are multiple sources to corroborate it. Such as Dr Fergusons statements I quote
"Both June and Shelia suffered delusional states of religion"
"She said he had some religious feelings - she had found God and felt relaxed"
I don't doubt, that at SOME time, Dr Ferguson said those words of both June and Sheila. However, they should be put into context. Dr Ferguson only saw these women when they were ill.
God featured hugely in June's life. None of her friends would contradict this fact. God was her guiding force and as such, in times of stress, it was to Him she turned -some might hit the bottle, chain smoke, or use food in varying degrees. I suspect that part of the problem, for June, was that when she became stressed/ill to the point where she couldn't function, she felt she'd let God down, rather than He had let her down. What is absolutely certain is that God was as big a part of June's life whether she was ill or well.
You haven't made clear, during which stay in hospital, the words you quote were said of Sheila, but "................she had found God and felt relaxed" certainly doesn't fit the Sheila described by one and all during the last two weeks of her life. If we go back to her last stay in hospital, she was very eager to get out because she didn't want her biological mother to see her there. I have no hesitation in believing that Sheila would have tried "God" as a way of placating June, but other than during her breakdowns, I really don't think she ever developed the kind of "relationship" with Him that June had.