More information:
Two people were killed (teacher and student) and two are in critical condition.
Part of her manifesto was shared on Discord. She stated she had a desire to kill all males and fantasized about killing all men. She specifically stated it doesn't matter if they are babies, children or adult men. Seemed to have the least care for black men and politicians dying, using "n*ggers" in the manifesto. She states she has been craving to kill them all. She says only when all males are dead can women start the world over.
She glorified other school shootings. She has a playlist on Spotify of songs dealing with suicide and murder. Her Tumblr has content about mass shooters and images suggesting she got a pistol for her 15th birthday.
So she was basically groomed online to blame men for everything and wanted to kill all of them.