RSBM.having arrived at the party at around 10pm, I do not believe she would likely have become so inebriated by 12:30 that she could not function
Thinking about myself, 2 and a half hours is enough to get totally blotto. Especially if I was drinking wine. Or spirits such as rum, vodka, whisky etc.
Depending on how fast Kiely was knocking the drinks back, I think she could've been completely drunk in an hour. Even more so when you consider she was only 16 and so slim-built.
MOO.