I dunno about it being rushed with her going mental. I mean, she has been haunted by the death of her friend, and then being responsible for the death of other friends, and now the death of her lover, so yeah, I'd be pissed and a little unstable too if that all happened when I was like, what, like between 11 and 16ish?
And yes the balloon tiddies are ridiculous, I'd get behind the story a lot more if we didn't have those. -_-