Her parents urged her to keep her head down and stay safe, but blood traitors are barely a step above half-bloods, who are only an inch above mudbloods, which means none of them are safe at all.
Her mom made her swear though, and the memory of the naked terror in her eyes keeps Ginny from acting - for a week, until she sees the tremors of the Crucio'ed first years.
She finds Luna and Neville: "We need the DA back, and this time we can't get caught."