I thought that, when people cut their wrists on TV its always across..I actually thought there was some kind of rule that they had to do it that way so if copycats tried, they would generally be unsucessful as its damn near impossible to die off doing it that way. So I was shocked to see it the 'right' way.

Apparently in the books, she just takes pills too. So they obviously changed it to that for visual effect. Still looked quite unrealistic though tbh.