WILLOW FEELS ABANDONED. Ever since the night she killed her older sister and her mother dropped her off at Camp Half-Blood, she hasn't left. She hasn't stepped foot out of the campgrounds since she was 10, except for the Titan War, and she hasn't contacted her mother since that awful night. She hasn't told anyone about it because, well, like most Ares kids, she's not good with words and expressing her feelings. She just bottles up her anger and uses it to drive her on the battlefield. It's only when Leo Valdez comes into the picture that everything changes.