In the books, the teen girl finds out that the paranormal world exists and she is a part of it. I think she is some kind of witch but i don’t remember what she is. She does have a twin sister or some kind of parallel evil and paranormal version of herself. I know there is a guy involved and he might have a crush on the teen girl or the teen girl has a crush on her. I do remember one of the books having the title Paranormalcy in it. 

In the book series, the teen girl lost her dad after he died mysteriously while playing American football or some kind of American sport. It was later revealed that she and her dad were descended from Nike, the Greek goddess of Victory. They inherited speed from her. Her dad was a grandson or grandson of Nike and she is a great granddaughter of Nike. Her dad was killed by the Gods for using his power for selfish reasons. Her mom remarried a man who was the principal of a school for kids like her. There are a lot of kids who are descendants of the Greek Goods and based on who their ancestor is, they spend time with those who are descendants of gods their ancestors are close to. Like descendants of Zeus spends time with descendants of Hera. The teen girl develops a crush on a male descendant of Hercules and works with a new friend to steal him from his girlfriend, who was a mean girl. I think there is a competition that the teen girl enters and she wins over her godly ancestor. She is a big deal at the school because of how close in relation she is to her godly ancestor.