Hereafter by Tara Hudson

Amelia saves a boy. She can't physically touch him because she is a ghost but he can see her for some reason. She wills him to live and he makes it. After that he helps her discover who she is. He also helps her feel alive. She finds out she has been dead for eighteen years and that quite a few things have changed. The only bad thing about being with Joshua is dealing with his grandmother. She can unfortunatly see Amelia also and is convinced that she is evil just because she died at the same place an evil ghost did. Amelia also has to deal with that ghost to. The ghost is also convinced that she should be his and his only. Haha thigs can still be complicated if your dead......