Poor girl. Mother disappeared, stress anguish over that. Father appearing as her source of strength. Mother found murdered and father only suspect. How would that effect anyone. All newspaper reports showed the police were only after one person and that was Boris. This is when the daughter stopped speaking with the police. I don't blame her. Also Boris's solicitor probably advised her not to talk which is her right.
About being a pot head. I don't see any sign of it, in fact she was a very studious University student before all this happened. If there was anyone else involved I would be looking at Boris's brother. He gave some weird interviews earlier. Poor Boris is in 23hour lock down now after being bashed on his first day in gaol. Hope they keep him safe until the trial.