Percy Jackson Fanfiction

What would happen if Percy Jackson found out that he has a little sister?
When Bethany Hawks, a young girl who, for the first thirteen years of her life, only had to worry about what mark she would get on her next school exam. Little did she know that after one meeting, after one conversation, that her life would never be the same again. She is suddenly thrown into a world of gods and goddesses. After a tragic event, even staying alive is a battle. She starts to doubt if it's even worth trying to survive. After all, how was she supposed to live when Earths most dangerous enemy will not stop at anything until her dead body is lying at his feet?

I do not own the characters or anything. It's a fanfiction.