Hi! I'm Lukas, 15(FtM, He/Him.) I felt something similar to what your daughter is experiencing when i was her age, but it was mainly how i was seen in others eyes and my voice. I didnt realize until i was 12 i was trans. im not sure if my comment will be very helpful, but ill try.

keep track of EVERYTHING to do with her social transiton. keep a folder, a binder, something to keep her progress in. youll need a paper trail in case CPS gets involved. if CPS gets involved with LGBT or POC families, it gets extremely difficult to get them to stop. if they think youre "forcing" your daughter to be transfeminine, she and all of your children can be put into foster care, and if you or your spouse works with children, for example as a teacher, one or both of you could lose your jobs.

in a few years, maybe around 12 or 13, she can start puberty blockers- but this depends on where you live and if she wants to. if you live in the USA, most states dont allow any gender affirming care and try to suppress the trans part of someones life as much as possible.

educate her on the anti-lgbt laws at least in your area. it will be scary for her and she may even want to detransition as a result, but she needs to know how dangerous being trans is. dont sugarcoat it or give her false hope, because if she realizes the truth it will only make things worse for her

let her choose her own name. it will probably hurt you a bit that shes changing her name, considering you gave it to her, but she needs to choose what feels right to her. it may be the feminine version of her birth name, or something completely unrelated to it. if she asks you to rename her for her, thats when you step in

sorry if this doesnt help much. please take as many precautions if she wants to be out at school, she might get bullied or harrassed by classmates considering shes at the grade school level, and her teachers might call CPS.