Well I assumed that the driving limit on alcohol would rightfully be fairly low, so two and a half times that would not be a significant amount. Given that you have said that it equates to four and a half pints I rather feel I was right.
Certainly doesn't seem enough to cause memory loss?
I read the same thing, but in the article linked it says she was estimated to be two and a half times the limit, i'm not a drinker but that sounds more tipsy than drunk, I could be completely wrong though.
http://www.bbc.co.uk/news/magazine-30697264