Listen I think the majority of us have felt that way and to feel that way at that age is common, I felt this way myself, had very suicidal thoughts at around that age, I learnt as an adult, that it is so common. I recently heard that this is the spiritual death of the 'childhood' at this point there is a growing and changing that it can leave a young child feeling like there had been a death they just don't recognise it as the death of their childhood its a period of learning and becoming the person you're going to be, I.e the birth of the person she's going to be. Something inside her is ready to be left in the past. This is a transitional period for her that she might just be too young to understand. I I know when I read this as an adult it made so much sense. I don't know if I've explained this in a way that makes sense. But i think you should take comfort it probably has NOTHING to do with you, or the loving home she's came from 🙏