Maybe her suspect is closer to home than Chris realises..At about 5.04 in the podcast, Chris Smith makes the comment about his interview with her 12 months following William's disappearance (paraphrased) that FFC has an idea about who has done this, but she wants to be accurate about it. (She also answered 'no' to Smith's suggestion about other persons...as if she was doing her own 'detective work'.
JMO: I would imagine that her hunch on who did it has been investigated fully and eventually discounted....under Gary Jubelin's handling of the case.
Be awful if she is innocent but surely they wouldn’t have done it again??