Over the years, Percy had grown extremely protective of Hazel. He liked having someone he could protect like a little sister.
When Sally heard about Hazel's situation, she immediately suggested adopting the slightly younger girl. Percy was ecstatic when he heard about this, and when they asked Hazel, she was as well.
That's how Hazel ended up living in the Jacksons' apartment. She liked Sally, a lot, but Percy, gods of Olympus, that boy was annoying. She had absolutely no idea how Annabeth could stand him day in and day out. Even for a demigod, he was extremely ADHD. And when he had sugar, well, she didn't exactly wanna repeat that incident.
Sally had suggested Hazel go to school, and since she was fifteen now, she would be a freshman at Goode. She'd gone for a day, and after that, Paul had decided to homeschool her. She'd been blown away by all the equations, essays, and the sheer amount of work. Back in New Orleans, she'd done simple sums in math, and some research papers and biographies in English.
Overall, life was better now for Hazel than it had ever been.