I'm writing a middle grade story, specifically an upper middle grade story about a twelve-year-old girl who lives on a planet where half of the population are born with magic powers. She is born powerless but later is granted the highest and rarest kind of power by a trio of goddesses that guide her throughout the story. But when a woman who used to have those same powers but had them cruelly taken away steals the little girl's power in order to get revenge on the world. The girl, once again powerless, has to learn how to save the planet using the power within her instead. I want to go for a sort of grim tone when writing the story, and there are certain things in the story that I'm not sure how to go about to a younger audience. For example, there is a scene where the antagonist literally rips the girl's wings off of her, and it harms her pretty badly and she goes into a coma. In this coma, she dreams and learns certain things, she learns about the antagonist's past, and she is encouraged by the trio of goddesses to not rely on the powers she used to have, and to use her inner power to defeat the antagonist instead. I'm not sure how to go about certain things like blood or violence, especially since the protagonist is a little girl.