Penn State Fraternities charged in teen death

[FSUZeta]

how has the sister of the deceased managed to not be charged with anything so far? when this was first reported, i couldn't help but think that if when the brother and his friends were visiting her at her apartment, the sister had stepped in and told her younger brother that he had had enough, that he needed to sleep it off at her apartment,(or taken him to the hospital for a stomach pumping) then this tragedy might have been averted.