Supernaturally

Sadie Gads-Winchester is a normal girl. At least, she was for the first 13 years of her life. Then one day, her father, the only family she had after her sisters and mom died, disappeared. Leaving her a necklace as her only clue, she went looking for answers. What she found wasn't what she expected. Now she is a hunter. She's only 14 years old, but you wouldn't guess by her attitude. Her sole purpose in life is finding her father and killing off every miserable supernatural creature she can find.
Until she meets the Winchester brothers. Suddenly her ideals were turned upside down. Now she thinks before she acts, and only kills the bad ones. Slowly and slowly, little Sadie learns more and more about her father and who he was. And slowly and slowly, she gets sucked up into things that might change her life even more than it already was.

I just wanna say I am VERY VERY bad at summaries. Ask my ELA teacher. I'm not kidding. But don't judge a book on how bad the summary is! Ok... Bye bye!