... To please explore all the reasons why she might feel intensely uncomfortable with her growing female body, and not just assume she's transgender?
There's such an epidemic of sexual assault, harassment and sexualised bullying towards girls of all ages. Kids are exposed to violent porn from the moment they can use a phone. Eating disorders are exploding, further evidence that hatred of bodies is rife among young people. Adolescence has always been a storm of hormones and emotions, girls have always discovered that their bodies are treated as public property but that is so much worse now.
If your daughter hates her female body please don't assume she's transgender. She might be, but it's far more likely that she is having a normal response to a really sexist society. She needs your help to discover how women throughout time have helped each other navigate this experience, looked after each other, and organised together to change things.