The Unbecoming of Mara Dyer by Michelle Hodkin

It doesn't really matter that this is the first book. Why? This one will keep you reading for hours. The next one is The Evolution of Mara Dyer. There is book three in the works. 

It is also paranormal and a romance in addition to the mystery Mara tries to figure out. It concerns her. While exploring a closed insane asylum, the ancient building collapses, killing three of her friends and sending her into a coma for five days. She has post traumatic stress syndrome (PTSD) and it's so bad the entire family moves to a different city in a different state. She is trying to remember what happened, that night but can't. Then weird things start happening. She looks in a mirror and sees her best friend's face. She comes home from a dance one night and things in the house have been moved, the bath she started has been turned off and she sees her earrings appear on the bottom of the tub.

She and her brother have transferred to an elite private school. On her first day, she enters her Algebra class and distinctly sees the walls collapsing in front of her and she falls to the floor to avoid a falling light.  Of course, it wasn't happening and everyone thinks she's weird and avoids her. 

Except this one very tall, slim beautiful boy. She's heard he's a heartbreaker and she resists getting involved, but she does. He cares for her. Even when it appears that she has killed her Spanish teacher just by imagining her choking to death. Maybe it's a coincidence. Or maybe not.