Since I haven't delved into this novel, I can only make general assumptions. The 'crow girl' in the title might be the protagonist. The story could revolve around her identity as a 'crow girl'. It could explore her relationships, her journey of self - discovery. For example, she might be an outcast in her society because of her association with crows, and the novel could be about how she overcomes the challenges and finds her place in the world.
Well, without having read the novel, it could be that the crow girl is a character with special powers or abilities related to crows. It could be a story set in a fantasy world where crows play a significant role, perhaps in a mystery or a quest that the girl has to undertake.
I'm not sure specifically as I haven't read it. But it might be about a girl who has some connection with crows. Maybe she can communicate with them or there are some adventures involving crows in her life.