Lookout, as God is my witness, I've NEVER ,in my life, raised more than my voice, in anger, at anyone, yet there have been times without number that I've sworn I could/I'd like to kill someone. Please don't tell me you never have. You have created a Sheila -a Sheila you want her to be- that, I imagine few would recognize.
First, it would be good to know who first found the diaries? Did they read them prior to handing them in. In this case, I'm fairly certain I would have. Then, I think you must make up your mind about the importance of these diaries. There seems to be some confusion. You now appear to be saying that whatever were the contents -even if they were irrefutable proof that Sheila was capable of murder/suicide- they handed them to the relatives at a time when they had no reason to believe she hadn't. Does that make any sense? What might make more sense is if the diaries said nothing of any consequence. Because of what seems to be a strong desire to point a finger EP/SJ/the relatives, you don't appear to have thought this through very clearly
Sheila was her own worst enemy. I've never written Sheila into " how I wanted her to be " ( what a strange suggestion ) she was a product of what this life is all about unless you hadn't noticed that nobody is cloned.
Whatever the girl did was overshadowed by her mother and so wasn't allowed to " be herself " . So many restrictions and put-downs during her times at WHF it was stifling.
I admit to raising my voice in the past------but NEVER EVER with a view to " murdering someone " That thought NEVER crossed my mind at any time. Killing/murdering wasn't in my vocabulary at all. Might have had something to do with the career I followed about saving lives, from the age of 16 onwards.
I don't know who found the diaries or where they were found but I can guess that the relatives would have been hunting high and low for them hoping they'd find them first----just in case !
The contents probably mirrored the notes which were found in Sheila's bedroom with perhaps more damning connotations of what went on between her mother and herself as deep down Sheila was a very angry person inside and to release her anger she wrote.
Perhaps someone else can elaborate on the diaries--------where/who found them.