Ask Me by Kimberly Pauley
From Goodreads: Ask Aria Morse anything, and she must answer with the truth. Yet she rarely understands the cryptic words she‘s compelled to utter. Blessed—or cursed—with the power of an Oracle who cannot decipher her own predictions, she does her best to avoid anyone and everyone.
But Aria can no longer hide when Jade, one of the few girls at school who ever showed her any kindness, disappears. Any time Aria overhears a question about Jade, she inadvertently reveals something new, a clue or hint as to why Jade vanished. But like stray pieces from different puzzles, her words never present a clear picture.
Then there’s Alex, damaged and dangerous, but the first person other than Jade to stand up for her. And Will, who offers a bond that seems impossible for a girl who’s always been alone. Both were involved with Jade. Aria may be the only one who can find out what happened, but the closer she gets to solving the crime, the more she becomes a target. Not everyone wants the truth to come out.
OOH! This sounds intriguing! And I love the cover!
It's published April 2014 by Soho Teen