Cut the ties. Let her go.
Then YOU get to love that little girl, to tell her it'll be ok, that she's safe nowm YOU have to do that. You can do it, but you'll need support, from here, and in RL. You need a counsellor.
Can you push for therapy, NHS or if you can manage to fund it yourself, orivate.
These wounds won't heal by themselves, but if you take the time to care for you, for that little girl, you'll begin to heal her pain.
You're at the beginning of a journey to a safe and happy place, to freedom, to the life you deserve.