It's clever, but...
I liked the idea of showing events through her, and particularly her friends' perspectives. It makes it unlike most crazy stalker movies. Unfortunately since we know what's coming the first half is too easily decoded by the viewer and it seems like an exercise in cleverness rather than successfully reeling us in for a surprise when the truth is revealed. I liked it, but by its very nature it could never succeed in the way it tries to.
"I'll book you. I'll book you on something. I'll find something in the book to book you on."