She is Little Red Riding Hood, which may be different from the Little Red Riding Hood you know.
She is a witch. She likes killing and watching others kill.
She likes to collect souls, all kinds of souls. As long as she likes them, she will try her best to get them.
So be careful. If you encounter a little girl claiming to be a witch on the street one day and wants to complete a deal with you, run away and don't look back.