More likely that it simply did not attract the publicity that unsolved murders get.
The simple fact is domestic murders rarely attract much publicity because they are solved practically as soon as committed and partly out of respect for other family members who not only have to cope with the death of a loved one but also the knowledge that another loved one was responsible. In these cases newspapers simply use the official press releases and many dont even bother sending a reporter.
The amount of publicity these murders get also depend on other news happening at the time. And let's face it a Jack the Ripper type unsolved murder story sells more newspapers than Mrs Smith stabbing her husband with the meat knife when she lost her temper.
If the woman had pleaded guilty at an early stage this too would not have attracted much attention. How many times have you perhaps heard of someone appearing in court being charged with murder and thought to yourself that you didn't even know there had been a murder!
As for her father being a JP. The case would have been dealt with outside the area because of possible conflict of interests, the difficulties in finding people who do not know the persons involved or of the incident etc. etc. Again this would not have attracted much interest from the newspapers - the local newspaper wouldn't bother to travel and the newspaper wherever the court case took place wouldn't bother because it was of no local interest.
Apart from which cover-up conspiracies are an American thing and certainly wouldn't have been in the North of Scotland in the 1960s and 70s.
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