The part about Sheila's so-called separation from the twins is a complete red herring. My guess is at most June offered Sheila the prospect of bringing in some of the local girls to babysit the twins as had been done previously.
We know from Helen Grimster's statement that Sheila was happy with the arrangement she had with Colin and indeed the divorce had brought them closer together. Dr Hugh Ferguson had previously stated he did not consider Sheila a suicide risk as "she had too much to live for".
If you can't work out by now who was behind all these rumours,the man who embellished half-truths into downright lies such as Sheila having to stay in a NHS hospital the next time she was ill when her parents were millionaires by today's standards,the lies about the rabbits and gun which was primed for murder,then I am genuinely sorry for you.
And if you haven't the sensitivity to understand that Sheila may have seen their "getting on better since the divorce" as reason to hope for reconciliation, I fear you know little of women.
As for the "red herring" of separating her from the twins, I rather imagine that if Sheila had been persuaded to take that "holiday", her parents, at 60 plus may have found it too much, caring full time for two boisterous boys.
Nobody needs to have been behind "embellished half truths" and "downright lies". Sheila's health was deteriorating. It matters little what Dr Ferguson noted about her back in March. By August it appears, for various reasons, she was a very different person. Didn't she say, in her letter to AE, that God had a mission for her to rid the world of evil? My apologies if she didn't.