I can confirm that Caroline has sent me the email, which is a notification of a forum PM dated 6th August 2013 from Maggie. It is clear that Caroline was having doubts about the case at a time when Paul Harrison was still stating in emails and PMs that his book was firmly pro Bamber and anti Essex Police. As I have already posted at the beginning of 2014 PH was still sticking to that position and only told me of the change in early February 2014.
Simply having doubts and being a hardcore guilter are two different things entirely.
Caroline became a hardcore guilter shortly after PH did. Caroline believed and endorsed the incriminating fiction that PH wrote in his book once it got released until it became indefensible.
Someone showing healthy scepticism and being open minded prior to being duped is nothing unexpected.