Two things about this. It's victim blaming the sister and it was a very unfortunate accident.
I'm not victim blaming anybody. The sister had no idea her sibling was going to turn up at her house. But the girl in question had a high level of blood alcohol which had put her at risk of hypothermia and had taken her shoes off and had no coat. Perhaps if she hadn't had so much to drink she might have been able to get help.
Her family begged other partygoers to take care after the inquest. I suppose that's victim blaming too? What do think they would think about warnings like this? Do you think they'd tut tut about victim blaming or wish perhaps their daughter might have had the same message and thought twice about walking home alone in freezing temperatures with no coat? And hope the same message gets through to other young people?
Honestly, I find this kind of thinking highly distasteful. Basically it looks at people who might fall victim to this sort of thing and could have been saved by warnings as collateral damage to satisfy their own political posturing.