6 spoilers for the movie Harry Potter and the Chamber of Secrets

Ginny was the one who did it all. She was controlled by Tom marvolo riddle, aka voldemort.

Harry sets Dobby free with a sock.

Lucius Malfoy gave the tom riddle diary to Ginny Weasley

There is a cursed child in it (Draco)

The Chamber of Secrets is Opened

Hermione gives birth at 12 in the middle of the plot, rendering her unable to contribute in battle