Daughter Of Olympus

Y/N Jackson and her brother Percy arrive at camp half-blood barely alive. They don't know what happened to their mother but they do know the monster responsible for her disappearance or death isn't going to hurt anyone for a while.
Y/N suffers from a head injury that keeps her in bed for numerous days but soon after recovering she quickly becomes adjusted to her new life at camp except she's still haunted by the memory of her mother's "death". Her and Percy are finally starting to fit in when capture the flag days arrives and Percy is claimed by Poseidon, the only problem? Y/N wasn't.