The letter content had consequences, which when she learned about it, she felt betrayed by her psrents, and ex-boyfriend ['Colin'], again ever that she had a relapse, which got brought on when 'Colin' told her, that 'they would never live together as a family'. As a result she sulked all the way during the journey from 'Colins home address' to white house farm and in this respect remained ' Silent ...
I am not trying to implicate 'Colin' as the killer, or perhaps even as '' Caffells' erstwhile accomplice!
The thing is, that to my mind, there was always going to be, 'inevitable consequences' surrounding the matters mentioned by 'Colin' in the letter in question! My point is, 'it's (or when) as in this instance, all the problems that 'Colin', ' his two boys, had 'to all intents and purposes', to 'deal with' it' in their own way. With that in mind, consider the evidence given to the court of trial, by 'Bradley'/'Knight' and 'other experts' or in other words how everything had to say regarding how 'everything that was' and 'had been occurring directly' or 'indirectly to anyone, or to all!