Hmm. I didn't really like this one at all. I think the main reason was that there was no compelling character in the story, we get no meat on the bones of even the main protagonist, only hints of events and happiness and failures, but nothing is allowed to be important. And given that what happened, happened between the lines, I would have needed a psychologically believable character. Also, there was a disturbing lack of originality (winning the lottery was all that was needed for a life of happiness, really ?) and a discomforting antimorality (as long as she only did things for herself, everything went fine, but as soon as she wanted to help anyone, she was punished to a life of loneliness and boredom).
By the way, was this a time travel or parallel universes story? I would say the latter, since even the first time she time traveled, things were a bit different than in her original life (the colleague who had never talked to her coming over for a chat).
And, yeah, I despised 'The Butterfly Effect'.