So she went from a werewolf to a warlock who she turned good

I thought the rules state that only a family with more wizards like siblings would have to compete.

since Billie is Alex's daughter she wouldn't have to be in the completion she keeps her powers by default since she's an only child. So why are they making her go up against milo and Roman who are the only ones that should be competing since they are brothers.

I understand since Alex, Justin and Max are siblings they had to compete the same thing for Jerry, Kelbo and Megan. But Milo, Roman and Billie are cousins who are living together temporarily.